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Acquisitions and Divestitures - Additional Information (Details) (USD $)
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0 Months Ended | 3 Months Ended | 6 Months Ended | 0 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended | |||||||
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Jul. 11, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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Dec. 31, 2013
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May 20, 2014
Woodside Properties
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Jun. 30, 2014
Woodside Properties
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Jun. 30, 2014
Woodside Properties
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Jun. 30, 2014
Callon Properties
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Jun. 30, 2013
Callon Properties
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Jun. 30, 2014
Callon Properties
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Jun. 30, 2013
Callon Properties
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Oct. 17, 2013
Callon Properties
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Sep. 26, 2013
West Delta Area Block Twenty Nine
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Jun. 30, 2014
West Delta Area Block Twenty Nine
Post Effective Date Repayment
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| Business Acquisition [Line Items] | ||||||||||||||||
| Percentage of non-operating working interest sold | 20.00% | |||||||||||||||
| Long-term debt, less current maturities | $ 1,224,262,000 | $ 1,224,262,000 | $ 1,205,421,000 | $ 53,400,000 | $ 53,400,000 | $ 83,000,000 | $ 83,000,000 | |||||||||
| Effective interest rate | 1.80% | 1.80% | 2.00% | 2.00% | ||||||||||||
| Federal statutory income tax rate | 35.00% | 35.00% | 35.00% | |||||||||||||
| Percentage of working interest include in producing interest | 15.00% | |||||||||||||||
| Adjustments to purchase price | 600,000 | |||||||||||||||
| Expenses associated with acquisition activities and transition activities | 100,000 | 100,000 | 0 | 0 | ||||||||||||
| Revenues | 262,994,000 | 235,383,000 | 517,510,000 | 494,605,000 | 6,900,000 | 6,900,000 | 8,700,000 | 17,400,000 | ||||||||
| Lease operating expenses | 61,765,000 | 68,248,000 | 117,384,000 | 127,590,000 | 700,000 | 700,000 | 1,000,000 | 2,000,000 | ||||||||
| Depreciation, depletion, amortization and accretion | 128,236,000 | 99,896,000 | 251,542,000 | 208,767,000 | 2,200,000 | 2,200,000 | 1,600,000 | 7,000,000 | ||||||||
| Income tax expense | 5,273,000 | 12,423,000 | 11,921,000 | 27,325,000 | 1,400,000 | 1,400,000 | 2,100,000 | 2,900,000 | ||||||||
| Net income | 9,837,000 | 22,396,000 | 21,026,000 | 49,014,000 | 2,600,000 | 2,600,000 | 4,000,000 | 5,500,000 | ||||||||
| Reversal of asset retirement obligation | 15,600,000 | 3,900,000 | ||||||||||||||
| Adjustment for effective date to sell properties | 4,300,000 | |||||||||||||||
| Proceeds from sale of non-operating working interest | $ 14,700,000 | $ 1,700,000 | ||||||||||||||