Derivative Instruments (Tables)

6 Months Ended

Jun. 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 Sheets		Derivative instruments subject to master netting agreements		Margin requirements with counterparties		Net derivative instruments
	(Thousands)
June 30, 2020
Asset derivative instruments, at fair value	$	915,441	$	(441,923)	$	(13,609)	$	459,909
Liability derivative instruments, at fair value	625,808		(441,923)		(9,257)		174,628
December 31, 2019
Asset derivative instruments, at fair value	$	812,664	$	(226,116)	$	—	$	586,548
Liability derivative instruments, at fair value	312,696		(226,116)		(12,606)		73,974