Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Provision at statutory rate									$ 36,397	$ 21,384	$ 33,367
Provision at statutory rate (as a percent)									21.00%	21.00%	35.00%
Non-taxable REIT income									$ (37,199)	$ (23,720)	$ (29,857)
Non-taxable REIT income (as a percent)									(21.50%)	(23.30%)	(31.30%)
State and local tax provision (benefit)									$ 43	$ (7)	$ 2,130
State and local tax provision (as a percent)									0.00%	0.00%	2.20%
Other									$ (620)	$ (2,601)	$ 1,511
Other (as a percent)									(0.40%)	(2.60%)	1.60%
Valuation allowance									$ 960	$ 3,887	$ (3,796)
Valuation allowance (as a percent)									0.60%	3.80%	(4.00%)
Total (benefit) provision	$ (172)	$ (187)	$ (134)	$ 74	$ (511)	$ (454)	$ (13)	$ (79)	$ (419)	$ (1,057)	$ 3,355
Total provision (as a percent)									(0.30%)	(1.10%)	3.50%