Quarterly report pursuant to Section 13 or 15(d)

Supplemental Guarantor Information - Condensed Consolidating Statement of Cash Flows (Details)

v2.4.1.9
Supplemental Guarantor Information - Condensed Consolidating Statement of Cash Flows (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Operating activities:    
Net income (loss) $ (255,095)us-gaap_NetIncomeLoss $ 11,189us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation, depletion, amortization and accretion 125,467us-gaap_DepreciationAmortizationAndAccretionNet 123,306us-gaap_DepreciationAmortizationAndAccretionNet
Ceiling test write-down of oil and natural gas properties 260,390us-gaap_ImpairmentOfOilAndGasProperties 0us-gaap_ImpairmentOfOilAndGasProperties
Amortization of debt issuance costs and premium 156us-gaap_AmortizationOfFinancingCostsAndDiscounts 187us-gaap_AmortizationOfFinancingCostsAndDiscounts
Share-based compensation 2,816us-gaap_ShareBasedCompensation 3,758us-gaap_ShareBasedCompensation
Derivative loss 0us-gaap_GainLossOnDerivativeInstrumentsNetPretax 7,492us-gaap_GainLossOnDerivativeInstrumentsNetPretax
Cash payments on derivative settlements   (4,670)wti_CashPaymentsReceiptsOnDerivativeSettlements
Deferred income taxes (103,574)us-gaap_DeferredIncomeTaxExpenseBenefit 6,645us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in operating assets and liabilities:    
Oil and natural gas receivables 21,121us-gaap_IncreaseDecreaseInAccountsReceivable 2,815us-gaap_IncreaseDecreaseInAccountsReceivable
Joint interest and other receivables 14,533us-gaap_IncreaseDecreaseInOtherReceivables 2,286us-gaap_IncreaseDecreaseInOtherReceivables
Income taxes (325)us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable (35)us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable
Prepaid expenses and other assets 17,246us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 2,709us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Asset retirement obligation settlements (19,554)us-gaap_AssetRetirementObligationCashPaidToSettle (16,342)us-gaap_AssetRetirementObligationCashPaidToSettle
Accounts payable, accrued liabilities and other (62,439)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (20,850)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Net cash provided by operating activities 742us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 118,490us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Investing activities:    
Investment in oil and natural gas properties and equipment (82,765)us-gaap_PaymentsToExploreAndDevelopOilAndGasProperties (95,067)us-gaap_PaymentsToExploreAndDevelopOilAndGasProperties
Purchases of furniture, fixtures and other (226)us-gaap_PaymentsToAcquireFurnitureAndFixtures (260)us-gaap_PaymentsToAcquireFurnitureAndFixtures
Net cash used in investing activities (82,991)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (95,327)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Financing activities:    
Borrowings of long-term debt - revolving bank credit facility 82,000us-gaap_ProceedsFromLongTermLinesOfCredit 92,000us-gaap_ProceedsFromLongTermLinesOfCredit
Repayments of long-term debt - revolving bank credit facility (15,000)us-gaap_RepaymentsOfLongTermLinesOfCredit (103,000)us-gaap_RepaymentsOfLongTermLinesOfCredit
Dividends to shareholders   (7,563)us-gaap_PaymentsOfDividends
Other (50)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (65)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net cash provided by (used in) financing activities 66,950us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (18,628)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Increase (decrease) in cash and cash equivalents (15,299)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 4,535us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period 23,666us-gaap_CashAndCashEquivalentsAtCarryingValue 15,800us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period 8,367us-gaap_CashAndCashEquivalentsAtCarryingValue 20,335us-gaap_CashAndCashEquivalentsAtCarryingValue
Parent Company    
Operating activities:    
Net income (loss) (255,095)us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
11,189us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation, depletion, amortization and accretion 75,152us-gaap_DepreciationAmortizationAndAccretionNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
62,431us-gaap_DepreciationAmortizationAndAccretionNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Ceiling test write-down of oil and natural gas properties 190,695us-gaap_ImpairmentOfOilAndGasProperties
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Amortization of debt issuance costs and premium 156us-gaap_AmortizationOfFinancingCostsAndDiscounts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
187us-gaap_AmortizationOfFinancingCostsAndDiscounts
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Share-based compensation 2,816us-gaap_ShareBasedCompensation
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
3,758us-gaap_ShareBasedCompensation
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Derivative loss   7,492us-gaap_GainLossOnDerivativeInstrumentsNetPretax
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash payments on derivative settlements   (4,670)wti_CashPaymentsReceiptsOnDerivativeSettlements
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Deferred income taxes (83,649)us-gaap_DeferredIncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
15,335us-gaap_DeferredIncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Earnings (loss) of affiliates 65,627wti_IncomeLossFromAffiliates
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(12,451)wti_IncomeLossFromAffiliates
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Changes in operating assets and liabilities:    
Oil and natural gas receivables 14,636us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,020us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Joint interest and other receivables 14,533us-gaap_IncreaseDecreaseInOtherReceivables
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
2,286us-gaap_IncreaseDecreaseInOtherReceivables
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Income taxes 15,287us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(15,321)us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Prepaid expenses and other assets 7,924us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(34,910)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Asset retirement obligation settlements (19,122)us-gaap_AssetRetirementObligationCashPaidToSettle
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(8,878)us-gaap_AssetRetirementObligationCashPaidToSettle
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Accounts payable, accrued liabilities and other (92,436)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
69,230us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash provided by operating activities (63,476)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
99,698us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Investing activities:    
Investment in oil and natural gas properties and equipment (18,750)us-gaap_PaymentsToExploreAndDevelopOilAndGasProperties
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(71,636)us-gaap_PaymentsToExploreAndDevelopOilAndGasProperties
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Investment in subsidiary 203us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(4,639)us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Purchases of furniture, fixtures and other (226)us-gaap_PaymentsToAcquireFurnitureAndFixtures
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(260)us-gaap_PaymentsToAcquireFurnitureAndFixtures
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash used in investing activities (18,773)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(76,535)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Financing activities:    
Borrowings of long-term debt - revolving bank credit facility 82,000us-gaap_ProceedsFromLongTermLinesOfCredit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
92,000us-gaap_ProceedsFromLongTermLinesOfCredit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Repayments of long-term debt - revolving bank credit facility (15,000)us-gaap_RepaymentsOfLongTermLinesOfCredit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(103,000)us-gaap_RepaymentsOfLongTermLinesOfCredit
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Dividends to shareholders   (7,563)us-gaap_PaymentsOfDividends
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other (50)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(65)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net cash provided by (used in) financing activities 66,950us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(18,628)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Increase (decrease) in cash and cash equivalents (15,299)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,535us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash and cash equivalents, beginning of period 23,666us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
15,800us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash and cash equivalents, end of period 8,367us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
20,335us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Guarantor Subsidiaries    
Operating activities:    
Net income (loss) (65,627)us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
12,451us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation, depletion, amortization and accretion 50,315us-gaap_DepreciationAmortizationAndAccretionNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
60,875us-gaap_DepreciationAmortizationAndAccretionNet
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Ceiling test write-down of oil and natural gas properties 69,695us-gaap_ImpairmentOfOilAndGasProperties
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
 
Deferred income taxes (19,925)us-gaap_DeferredIncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(8,690)us-gaap_DeferredIncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Changes in operating assets and liabilities:    
Oil and natural gas receivables 6,485us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(1,205)us-gaap_IncreaseDecreaseInAccountsReceivable
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Income taxes (15,612)us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
15,286us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Prepaid expenses and other assets 38,985us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(53,598)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Asset retirement obligation settlements (432)us-gaap_AssetRetirementObligationCashPaidToSettle
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(7,464)us-gaap_AssetRetirementObligationCashPaidToSettle
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Accounts payable, accrued liabilities and other 334us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
1,137us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Net cash provided by operating activities 64,218us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
18,792us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Investing activities:    
Investment in oil and natural gas properties and equipment (64,015)us-gaap_PaymentsToExploreAndDevelopOilAndGasProperties
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(23,431)us-gaap_PaymentsToExploreAndDevelopOilAndGasProperties
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Net cash used in investing activities (64,015)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
(23,431)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Financing activities:    
Investment from parent (203)us-gaap_ProceedsFromContributionsFromParent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
4,639us-gaap_ProceedsFromContributionsFromParent
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Net cash provided by (used in) financing activities (203)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
4,639us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ dei_LegalEntityAxis
= us-gaap_GuarantorSubsidiariesMember
Eliminations    
Operating activities:    
Net income (loss) 65,627us-gaap_NetIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(12,451)us-gaap_NetIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Earnings (loss) of affiliates (65,627)wti_IncomeLossFromAffiliates
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
12,451wti_IncomeLossFromAffiliates
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Changes in operating assets and liabilities:    
Prepaid expenses and other assets (29,663)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
91,217us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Accounts payable, accrued liabilities and other 29,663us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(91,217)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Investing activities:    
Investment in subsidiary (203)us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
4,639us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Net cash used in investing activities (203)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
4,639us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Financing activities:    
Investment from parent 203us-gaap_ProceedsFromContributionsFromParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
(4,639)us-gaap_ProceedsFromContributionsFromParent
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
Net cash provided by (used in) financing activities $ 203us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember
$ (4,639)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
/ us-gaap_ConsolidationItemsAxis
= us-gaap_ConsolidationEliminationsMember