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Derivatives - Fair Value of Derivative Contracts (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Derivatives, Fair Value    
Derivative assets $ 122,307 $ 338,417
Derivative liabilities (3,436) 0
Total net derivative contracts 113,397 338,417
Current assets    
Derivatives, Fair Value    
Derivative assets 106,058 291,414
Noncurrent assets    
Derivatives, Fair Value    
Derivative assets 16,249 47,003
Current liabilities    
Derivatives, Fair Value    
Derivative liabilities (3,110) 0
Noncurrent liabilities    
Derivatives, Fair Value    
Derivative liabilities (326) 0
Oil Price Swaps | Current assets    
Derivatives, Fair Value    
Derivative assets 69,890 204,072
Oil Price Swaps | Noncurrent assets    
Derivatives, Fair Value    
Derivative assets 13,689 36,288
Natural Gas Price Swaps | Current assets    
Derivatives, Fair Value    
Derivative assets 2,938 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 (3,110) 0
Natural Gas Basis Swaps | Noncurrent liabilities    
Derivatives, Fair Value    
Derivative liabilities (326) 0
Long-term Debt Holder Conversion Feature | Long-term debt    
Derivatives, Fair Value    
Derivative liabilities (5,474) 0
Oil Collars - Three Way | Current assets    
Derivatives, Fair Value    
Derivative assets 32,873 56,289
Oil Collars - Three Way | Noncurrent assets    
Derivatives, Fair Value    
Derivative assets 2,560 10,715
Natural Gas Collars | Current assets    
Derivatives, Fair Value    
Derivative assets $ 357 $ 1,055