Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2020

Fair Value Disclosures [Abstract]

Schedule of assets and liabilities measured at fair value on a recurring basis

The table below summarizes assets and liabilities measured at fair value on a recurring basis.

	Gross derivative instruments recorded in the Condensed Consolidated Balance Sheets		Fair value measurements at reporting date using:
			Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
	(Thousands)
March 31, 2020
Asset derivative instruments, at fair value	$	1,053,502	$	154,591	$	898,911	$	—
Liability derivative instruments, at fair value	526,601		121,381		405,220		—
December 31, 2019
Asset derivative instruments, at fair value	$	812,664	$	95,041	$	717,623	$	—
Liability derivative instruments, at fair value	312,696		71,107		241,589		—