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Acquisitions and Divestitures - Additional Information (Details) (USD $)
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0 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended | |||||||||||
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Jul. 11, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Dec. 31, 2013
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Sep. 15, 2014
Fairway Field
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Sep. 14, 2014
Fairway Field
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Sep. 30, 2014
Woodside Properties
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Sep. 30, 2014
Woodside Properties
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May 20, 2014
Woodside Properties
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Sep. 30, 2014
Callon Properties
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Sep. 30, 2013
Callon Properties
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Sep. 30, 2014
Callon Properties
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Sep. 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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Sep. 26, 2013
West Delta Area Block Twenty Nine
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Sep. 30, 2014
West Delta Area Block Twenty Nine
Post Effective Date Repayment
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| Business Acquisition [Line Items] | |||||||||||||||||||
| Percentage of working interest | 100.00% | 64.30% | 20.00% | 15.00% | |||||||||||||||
| Long-term debt, less current maturities | $ 1,260,665,000 | $ 1,260,665,000 | $ 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% | ||||||||||||||||
| Adjustments to purchase price | 600,000 | ||||||||||||||||||
| Expenses associated with acquisition activities and transition activities | 100,000 | 0 | 0 | ||||||||||||||||
| Revenues | 234,521,000 | 244,555,000 | 752,031,000 | 739,160,000 | 12,500,000 | 19,400,000 | 9,500,000 | 27,000,000 | |||||||||||
| Lease operating expenses | 71,732,000 | 67,346,000 | 189,116,000 | 194,935,000 | 1,700,000 | 2,400,000 | 2,200,000 | 4,200,000 | |||||||||||
| Depreciation, depletion, amortization and accretion | 128,671,000 | 104,143,000 | 380,213,000 | 312,911,000 | 4,300,000 | 6,500,000 | 4,200,000 | 11,200,000 | |||||||||||
| Income tax expense | 904,000 | 8,033,000 | 12,825,000 | 35,358,000 | 2,300,000 | 3,700,000 | 1,100,000 | 4,100,000 | |||||||||||
| Net income | 684,000 | 14,194,000 | 21,710,000 | 63,208,000 | 4,200,000 | 6,800,000 | 2,000,000 | 7,500,000 | |||||||||||
| Reduction of ARO related to disposition | 15,600,000 | 3,900,000 | |||||||||||||||||
| Proceeds from (payment for) sale of non-operating working interest | $ (4,300,000) | $ 14,700,000 | $ 1,700,000 | ||||||||||||||||