Annual report pursuant to Section 13 and 15(d)

Derivative Instruments - Assets and liabilities (Details)

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Derivative Instruments - Assets and liabilities (Details) - Commodity derivative - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Commodity derivative assets    
Gross amounts on balance sheet $ 882,817 $ 658,830
Gross amounts offset on balance sheet (126,794) (51,398)
Total asset derivatives 756,023 607,432
Commodity derivative liabilities    
Gross amounts on balance sheet (137,034) (51,930)
Gross amounts offset on balance sheet 126,794 51,398
Total liability derivatives $ (10,240) $ (532)