Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments - Assets and liabilities (Details)

v3.19.1
Derivative Instruments - Assets and liabilities (Details) - Commodity derivative - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Commodity derivative assets    
Gross amounts on balance sheet $ 459,928 $ 658,830
Gross amounts offset on balance sheet (23,594) (51,398)
Total asset derivatives 436,334 607,432
Commodity derivative liabilities    
Gross amounts on balance sheet (27,488) (51,930)
Gross amounts offset on balance sheet 23,594 51,398
Total liability derivatives $ (3,894) $ (532)