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Fair Value, Level 3 Derivative Instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Derivative assets      
Beginning balance $ 1,967 $ 1,066 $ 324
Settlements (112,836) (164,654) (83,992)
Realized gains recorded in earnings 110,869 163,588 83,668
Unrealized gains recorded in earnings 295 1,967 1,066
Ending balance $ 295 $ 1,967 $ 1,066