Summary of Significant Accounting Policies - Litigation and non-routine costs, net (Details) - USD ($) $ in Thousands, shares in Millions		3 Months Ended		6 Months Ended
	Jul. 16, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Litigation and non-routine costs, net:
Audit Committee Investigation and related matters		$ (118)	$ 22,767	$ (6,211)	$ 37,458
Legal fees and expenses		0	0	0	2
Litigation settlements		0	0	0	12,235
Total costs		(118)	22,767	(6,211)	49,695
Insurance recoveries		0	0	(2,471)	(48,420)
Other recoveries		0	(26,536)	0	(26,536)
Total		$ (118)	$ (3,769)	$ (8,682)	$ (25,261)
Surrender of Limited Partner OP Units	2.9