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Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Offsetting Assets The table below summarizes the impact of netting agreements and margin deposits on gross derivative assets and liabilities.
Gross derivative instruments recorded in the
Consolidated Balance Sheet		Derivative instruments
subject to master
netting agreements		Margin requirements with
counterparties		Net derivative
instruments
December 31, 2021(Thousands)
Asset derivative instruments at fair value$543,337 $(468,266)$— $75,071 
Liability derivative instruments at fair value2,413,608 (468,266)(147,773)1,797,569 
December 31, 2020
Asset derivative instruments at fair value$527,073 $(328,809)$— $198,264 
Liability derivative instruments at fair value600,877 (328,809)(82,552)189,516 
Offsetting Liabilities The table below summarizes the impact of netting agreements and margin deposits on gross derivative assets and liabilities.
Gross derivative instruments recorded in the
Consolidated Balance Sheet		Derivative instruments
subject to master
netting agreements		Margin requirements with
counterparties		Net derivative
instruments
December 31, 2021(Thousands)
Asset derivative instruments at fair value$543,337 $(468,266)$— $75,071 
Liability derivative instruments at fair value2,413,608 (468,266)(147,773)1,797,569 
December 31, 2020
Asset derivative instruments at fair value$527,073 $(328,809)$— $198,264 
Liability derivative instruments at fair value600,877 (328,809)(82,552)189,516