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Derivative Instruments (Tables)
 9 Months Ended
Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of Impact of Netting Agreements and Margin Deposits on Gross Derivative 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 Condensed Consolidated Balance SheetsDerivative instruments subject to
master netting agreements		Margin requirements with counterpartiesNet derivative instruments
 (Thousands)
September 30, 2020
Asset derivative instruments, at fair value$503,648 $(433,954)$— $69,694 
Liability derivative instruments, at fair value894,618 (433,954)(244,457)216,207 
December 31, 2019
Asset derivative instruments, at fair value$812,664 $(226,116)$— $586,548 
Liability derivative instruments, at fair value312,696 (226,116)(12,606)73,974