Summary of Significant Accounting Policies - Litigation and non-routine costs, net (Details) - USD ($) $ in Thousands, shares in Millions			3 Months Ended	12 Months Ended
	Oct. 15, 2019	Jul. 16, 2019	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Litigation and non-routine costs, net:
Audit Committee Investigation and related matters				$ 70,168	$ 59,755	$ 49,434
Legal fees and expenses				2	530	421
Litigation settlements				820,208	233,246	0
Merger related transfer taxes				0	0	(1,595)
Total costs				890,378	293,531	48,260
Insurance recoveries				(48,420)	(2,568)	(300)
Other recoveries			$ (26,500)	(26,536)	0	0
Total				$ 815,422	290,963	$ 47,960
Insurance recoveries related to prior period merger					$ 2,300
Partnership units, surrendered (in shares)	19.9	2.9