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Derivative Financial Instruments (Details 2) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Summary of gross liability balances of derivative instruments    
Total $ 8,912 $ (24,954)
Gross amounts netted in the condensed consolidated balance sheets (45) 0
Net amounts presented in the condensed consolidated balance sheets 8,867 (24,954)
Current assets    
Derivative [Line Items]    
Gross amounts of recognized assets 10,835  
Gross amounts netted in the condensed consolidated balance sheets (3,768)  
Oil, natural gas and natural gas liquids (NGL) derivatives 7,067  
Other assets    
Derivative [Line Items]    
Gross amounts of recognized assets 5,066  
Gross amounts netted in the condensed consolidated balance sheets (2,074)  
Oil, natural gas and natural gas liquids (NGL) derivatives 2,992  
Current liabilities    
Summary of gross liability balances of derivative instruments    
Gross amounts of recognized liabilities (4,915) (24,203)
Gross amounts netted in the condensed consolidated balance sheet 3,723 0
Oil, natural gas and natural gas liquids (NGL) derivatives (1,192) (24,203)
Other liabilities    
Summary of gross liability balances of derivative instruments    
Gross amounts of recognized liabilities (2,074) (751)
Gross amounts netted in the condensed consolidated balance sheet 2,074 0
Oil, natural gas and natural gas liquids (NGL) derivatives $ 0 $ (751)