Income Taxes - Reconciliation of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Effective Income Tax Rate Reconciliation, Amount
Pre-tax income attributable to taxable subsidiaries	$ (15,374)	$ 72,343	$ 21,131
Federal (benefit) provision at statutory tax rate (35%)	(5,380)	25,244	7,396
Change in valuation allowance	6,477	9,074
Non-taxable income	(5,399)	(5,475)
Non-deductible expense	3,111	6,982
State and local taxes, net of federal benefit	2,749	6,151	2,296
Rate differential	892	(10,589)
Other	838	6,234	893
Recognition of taxable income as a result of the CPA®:16 Merger			4,833
Interest			2,111
Dividend income from Managed REITs			939
Tax provision — taxable subsidiaries			18,468
Deferred foreign tax benefit	(17,231)	(1,720)	(9,925)
Current foreign taxes			6,869
Other state and local taxes			2,197
Total provision	$ 3,288	$ 37,621	$ 17,609