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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, 2019
Dec. 31, 2018
Derivative asset - current    
Derivatives, Fair Value [Line Items]    
Gross recognized assets $ 13,321 $ 48,662
Gross amounts offset, assets (4,461) (4,774)
Total financial assets 8,860 43,888
Derivative liability - current    
Derivatives, Fair Value [Line Items]    
Gross recognized liabilities 11,350 5,302
Gross amounts offset, liabilities (4,461) (4,774)
Total financial liabilities 6,889 528
Derivative asset - noncurrent    
Derivatives, Fair Value [Line Items]    
Gross recognized assets 1,031 23,605
Gross amounts offset, assets (261) (2,484)
Total financial assets 770 21,121
Derivative liability - noncurrent    
Derivatives, Fair Value [Line Items]    
Gross recognized liabilities 261 4,375
Gross amounts offset, liabilities (261) (2,484)
Total financial liabilities $ 0 $ 1,891