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Derivatives - Fair Value of Derivative Contracts (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Derivatives, Fair Value    
Derivative assets $ 1,079 $ 5,582
Derivative liabilities (45,004) (18,467)
Total net derivative contracts (43,925) (12,885)
Current Assets    
Derivatives, Fair Value    
Derivative assets 1,079 5,582
Current Liabilities    
Derivatives, Fair Value    
Derivative liabilities (36,362) (14,899)
Noncurrent Liabilities    
Derivatives, Fair Value    
Derivative liabilities (8,642) (3,568)
Natural gas price swaps | Current Assets    
Derivatives, Fair Value    
Derivative assets (1,079) 5,582
Oil price swaps | Current Liabilities    
Derivatives, Fair Value    
Derivative liabilities (36,362) (14,899)
Oil price swaps | Noncurrent Liabilities    
Derivatives, Fair Value    
Derivative liabilities $ (8,642) $ (3,568)