Summary of Significant Accounting Policies - Litigation and non-routine costs, net (Details) - USD ($) $ in Thousands, shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Litigation and non-routine costs, net:
Audit Committee Investigation and related matters	$ 105	$ 32,051	$ (6,106)	$ 69,509
Legal fees and expenses	0	0	0	2
Litigation settlements	0	799,973	0	812,208
Total costs	105	832,024	(6,106)	881,719
Insurance recoveries	0	0	(2,471)	(48,420)
Other recoveries	0	0	0	(26,536)
Total	$ 105	$ 832,024	$ (8,577)	$ 806,763
Surrender of Limited Partner OP Units				2.9