Quarterly report pursuant to Section 13 or 15(d)

Acquisitions and Divestitures - Additional Information (Details)

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Acquisitions and Divestitures - Additional Information (Details) (USD $)
 0 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended
Jul. 11, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Sep. 15, 2014
Fairway Field
Sep. 14, 2014
Fairway Field
Sep. 30, 2014
Woodside Properties
Sep. 30, 2014
Woodside Properties
May 20, 2014
Woodside Properties
Sep. 30, 2014
Callon Properties
Sep. 30, 2013
Callon Properties
Sep. 30, 2014
Callon Properties
Sep. 30, 2013
Callon Properties
Oct. 17, 2013
Callon Properties
Sep. 26, 2013
West Delta Area Block Twenty Nine
Sep. 26, 2013
West Delta Area Block Twenty Nine
Sep. 30, 2014
West Delta Area Block Twenty Nine
Post Effective Date Repayment
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