Annual report pursuant to Section 13 and 15(d)

Supplemental Oil and Gas Disclosures - Schedule of Prices Weighted by Field Production Related to Proved Reserves (Details)

v2.4.1.9
Supplemental Oil and Gas Disclosures - Schedule of Prices Weighted by Field Production Related to Proved Reserves (Details)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Oil        
Reserve Quantities [Line Items]        
Weighted price 91.12wti_WeightedAveragePricesUsedToEstimateReserves
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= us-gaap_OilReservesMember
99.65wti_WeightedAveragePricesUsedToEstimateReserves
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= us-gaap_OilReservesMember
98.13wti_WeightedAveragePricesUsedToEstimateReserves
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= us-gaap_OilReservesMember
97.36wti_WeightedAveragePricesUsedToEstimateReserves
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= us-gaap_OilReservesMember
NGLs        
Reserve Quantities [Line Items]        
Weighted price 34.63wti_WeightedAveragePricesUsedToEstimateReserves
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= us-gaap_NaturalGasLiquidsReservesMember
35.21wti_WeightedAveragePricesUsedToEstimateReserves
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= us-gaap_NaturalGasLiquidsReservesMember
47.30wti_WeightedAveragePricesUsedToEstimateReserves
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= us-gaap_NaturalGasLiquidsReservesMember
51.30wti_WeightedAveragePricesUsedToEstimateReserves
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= us-gaap_NaturalGasLiquidsReservesMember
Natural Gas        
Reserve Quantities [Line Items]        
Weighted price 4.27wti_WeightedAveragePricesUsedToEstimateReserves
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= us-gaap_NaturalGasReservesMember
3.80wti_WeightedAveragePricesUsedToEstimateReserves
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= us-gaap_NaturalGasReservesMember
2.77wti_WeightedAveragePricesUsedToEstimateReserves
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= us-gaap_NaturalGasReservesMember
4.11wti_WeightedAveragePricesUsedToEstimateReserves
/ us-gaap_ReserveQuantitiesByTypeOfReserveAxis
= us-gaap_NaturalGasReservesMember