Quarterly report pursuant to Section 13 or 15(d)

Acquisitions and Divestitures - Additional Information (Details)

v3.2.0.727
Acquisitions and Divestitures - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Sep. 15, 2014
Sep. 14, 2014
May. 20, 2014
Business Acquisition [Line Items]              
Revenues $ 149,066,000 $ 262,994,000 $ 276,973,000 $ 517,510,000      
DD&A 103,342,000 128,236,000 228,809,000 251,542,000      
Income tax expense (44,134,000) 5,273,000 (147,708,000) 11,921,000      
Net income (loss) (260,449,000) $ 9,837,000 (515,544,000) $ 21,026,000      
Fairway              
Business Acquisition [Line Items]              
Percentage of working interest         100.00% 64.30%  
Adjustments to purchase price     1,300,000        
Goodwill, acquired during period     0        
Woodside Properties              
Business Acquisition [Line Items]              
Percentage of working interest             20.00%
Adjustments to purchase price     200,000        
Goodwill, acquired during period     0        
Revenues 7,900,000   13,400,000        
Direct operating expenses 1,800,000   5,100,000        
DD&A 3,900,000   8,000,000        
Income tax expense 800,000   100,000        
Net income (loss) $ 1,400,000   $ 200,000