Impact of Derivative Activities on Condensed Consolidated Statements of Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	$ (6,683)	$ 0
Derivatives	151,119	(68,017)
Gain (Loss) on Commodity Derivative Instruments	157,802	(68,017)
Cash Settlements Interest Rate Swap Operating Activities	68	0
Cash Settlements Commodity Operating Activities	(337)	4,394
Cash settlements, net	$ (269)	$ 4,394