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Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Provision at statutory rate									$ 33,367	$ 24,561	$ 28,892
Provision at statutory rate (as a percent)									35.00%	35.00%	35.00%
Non-taxable REIT income									$ (29,857)	$ (20,672)	$ (25,733)
Non-taxable REIT income (as a percent)									(31.30%)	(29.50%)	(31.20%)
State and local tax provision									$ 2,130	$ 187	$ 1,284
State and local tax provision (as a percent)									2.20%	0.30%	1.60%
Other									$ 1,511	$ (502)	$ 24,047
Other (as a percent)									1.60%	(0.70%)	29.10%
Valuation allowance									$ (3,796)	$ (479)	$ (23,955)
Valuation allowance (as a percent)									(4.00%)	(0.70%)	(29.00%)
Total provision	$ 1,169	$ 507	$ 442	$ 1,237	$ 375	$ 163	$ 2,366	$ 191	$ 3,355	$ 3,095	$ 4,535
Total provision (as a percent)									3.50%	4.40%	5.50%

X

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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