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Derivative Financial Instruments - Schedule of Location and Fair Value Amounts of All Derivative Instruments (Details) - Derivatives Not Designated as Hedging Contracts - Commodity Contracts - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Derivative asset - current    
Derivatives, Fair Value [Line Items]    
Gross Recognized Assets $ 48,662 $ 184
Gross Amounts Offset, Assets (4,774) 0
Total financial assets 43,888 184
Derivative liability - current    
Derivatives, Fair Value [Line Items]    
Gross Recognized Liabilities 5,302 11,805
Gross Amounts Offset, Liabilities (4,774) 0
Total financial liabilities 528 11,805
Derivative asset - noncurrent    
Derivatives, Fair Value [Line Items]    
Gross Recognized Assets 23,605 0
Gross Amounts Offset, Assets (2,484) 0
Total financial assets 21,121 0
Derivative liability - noncurrent    
Derivatives, Fair Value [Line Items]    
Gross Recognized Liabilities 4,375 1,826
Gross Amounts Offset, Liabilities (2,484) 0
Total financial liabilities $ 1,891 $ 1,826