Annual report pursuant to Section 13 and 15(d)

Derivative Instruments - Schedule of Derivative Instruments in Statement of Financial Position (Details)

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Derivative Instruments - Schedule of Derivative Instruments in Statement of Financial Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Derivative [Line Items]    
Total short-term derivative instruments – asset $ 126,201 $ 21,352
Long-term derivative instruments 563 0
Total short-term derivative instruments – liability 303 20,401
Total long-term derivative instruments – liability 53,135 13,992
Commodity Derivative Instruments    
Derivative [Line Items]    
Total short-term derivative instruments – asset 125,383 21,352
Long-term derivative instruments 0 0
Contingent consideration arrangement    
Derivative [Line Items]    
Total short-term derivative instruments – asset 818 0
Long-term derivative instruments $ 563 $ 0