XML 45 R34.htm IDEA: XBRL DOCUMENT v3.21.1
Derivative Instruments - Effect of Derivative Instruments on the Condensed Consolidated Balance Sheet (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Effect of derivative instruments on the Consolidated Balance Sheet    
Derivative Assets $ 9,574 $ 26,209
Derivative instruments (current) | Derivatives Not Designated as Hedges | Commodity contracts    
Effect of derivative instruments on the Consolidated Balance Sheet    
Derivative Assets 9,574 26,209
Derivative Liabilities $ 0 $ 0