Summary of Significant Accounting Policies - Litigation and Non-routine Costs, Net (Details) - USD ($) $ in Thousands, shares in Millions		3 Months Ended			9 Months Ended
	Jul. 16, 2019	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Litigation and non-routine costs, net:
Audit Committee Investigation and related matters		$ 32,051		$ 13,009	$ 69,509	$ 51,969
Legal fees and expenses		0		386	2	521
Litigation settlements		799,973		127,500	812,208	217,500
Total costs		832,024		140,895	881,719	269,990
Insurance recoveries		0		(2,300)	(48,420)	(2,568)
Other recoveries		0	$ 26,500	0	(26,536)	0
Total		$ 832,024		$ 138,595	$ 806,763	$ 267,422
Partnership units, surrendered (in shares)	2.9