Condensed Consolidated Statements of Equity (Unaudited) - USD ($) $ in Thousands	Total	Member's Investment	Retained earnings	Non-controlling interest in equity of subsidiaries
Balance at beginning of period at Dec. 31, 2018	$ 4,488,017	$ 3,478,744	$ 999,706	$ 9,567
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	750,173		750,230	(57)
Stock-based compensation	6,735	6,735
Contributions from (distributions to) member, net	4,528	4,528
Other	(1,918)	(1,914)	(4)	0
Balance at end of period at Mar. 31, 2019	5,247,535	3,488,093	1,749,932	9,510
Balance at beginning of period at Dec. 31, 2019	6,506,069	3,311,400	3,185,869	8,800
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	(640,065)		(640,040)	(25)
Stock-based compensation	2,549	2,549
Contributions from (distributions to) member, net	3,712	3,712
Other	(4,062)	(1,081)	(2,981)
Balance at end of period at Mar. 31, 2020	$ 5,868,203	$ 3,316,580	$ 2,542,848	$ 8,775