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Derivatives - Fair Value of Derivative Contracts (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Derivatives, Fair Value    
Derivative assets $ 146,124 $ 338,417
Derivative liabilities (2,207) 0
Total net derivative contracts 143,917 338,417
Current assets    
Derivatives, Fair Value    
Derivative assets 122,672 291,414
Noncurrent assets    
Derivatives, Fair Value    
Derivative assets 23,452 47,003
Current liabilities    
Derivatives, Fair Value    
Derivative liabilities (2,199) 0
Noncurrent liabilities    
Derivatives, Fair Value    
Derivative liabilities (8) 0
Oil Price Swaps | Current assets    
Derivatives, Fair Value    
Derivative assets 70,528 204,072
Oil Price Swaps | Noncurrent assets    
Derivatives, Fair Value    
Derivative assets 18,867 36,288
Natural Gas Price Swaps | Current assets    
Derivatives, Fair Value    
Derivative assets 4,757 29,648
Natural Gas Basis Swaps | Current assets    
Derivatives, Fair Value    
Derivative assets 0 350
Natural Gas Basis Swaps | Current liabilities    
Derivatives, Fair Value    
Derivative liabilities (2,199) 0
Natural Gas Basis Swaps | Noncurrent liabilities    
Derivatives, Fair Value    
Derivative liabilities (8) 0
Oil Collars - Three Way | Current assets    
Derivatives, Fair Value    
Derivative assets 46,825 56,289
Oil Collars - Three Way | Noncurrent assets    
Derivatives, Fair Value    
Derivative assets 4,585 10,715
Natural Gas Collars | Current assets    
Derivatives, Fair Value    
Derivative assets $ 562 $ 1,055