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Derivative Instruments - Schedule of Location and Fair Value of Outstanding Commodity Derivative Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amounts recognized $ 50,311 $ 482
Derivative liability, gross amount recognized   81,002
Derivative asset, gross amounts offset (6,626) (120)
Derivative liability, gross amounts offset   (8,819)
Derivative asset, net asset 43,685 362
Derivative liability, net liability   72,183
Commodity derivative instruments [Member] | Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amounts recognized 37,829 482
Derivative asset, gross amounts offset (5,978) (120)
Derivative asset, net asset 31,851 362
Commodity derivative instruments [Member] | Noncurrent Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative asset, gross amounts recognized 12,482  
Derivative asset, gross amounts offset (648)  
Derivative asset, net asset $ 11,834  
Commodity derivative instruments [Member] | Current Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross amount recognized   66,838
Derivative liability, gross amounts offset   (6,369)
Derivative liability, net liability   60,469
Commodity derivative instruments [Member] | Noncurrent Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liability, gross amount recognized   14,164
Derivative liability, gross amounts offset   (2,450)
Derivative liability, net liability   $ 11,714