Segment Information - Additional Information (Details) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) segment	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Segment information
Number of reportable segments | segment				2
Total revenues		$ 249,844	$ 313,634	$ 817,846	$ 930,913
Net income		20,677	40,722	214,418	267,232
Total assets	[1]	12,324,039		12,324,039		$ 12,766,320
Marketing, general and administrative		23,602	23,841	66,682	75,300
Operating Segments | Real Estate Segment
Segment information
Total revenues		226,856	262,115	716,382	777,745
Net income		10,097	6,133	161,388	168,639
Total assets		11,079,252		11,079,252		11,063,155
Operating Segments | Debt and Preferred Equity Segment
Segment information
Total revenues		22,988	51,519	101,464	153,168
Net income		10,580	$ 34,589	53,030	$ 98,593
Total assets		$ 1,244,787		$ 1,244,787		$ 1,703,165

[1] The Company's consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs"). See Note 2. The consolidated balance sheets include the following amounts related to our consolidated VIEs, excluding the Operating Partnership: $375.9 million and $205.2 million of land, $1.4 billion and $481.9 million of building and improvements, $2.0 million and $2.0 million of building and leasehold improvements, $61.7 million and $61.7 million of right of use assets, $296.3 million and $17.6 million of accumulated depreciation, $322.8 million and $169.5 million of other assets included in other line items, $510.7 million and $457.1 million of real estate debt, net, $1.1 million and $1.2 million of accrued interest payable, $58.4 million and 57.7 million of lease liabilities, and $48.9 million and $43.7 million of other liabilities included in other line items as of September 30, 2020 and December 31, 2019, respectively.