Segment Information - Additional Information (Details) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) segment	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Segment information
Number of reportable segments | segment				2
Total revenues		$ 253,699	$ 313,024	$ 568,002	$ 617,279
Net income		66,627	173,741	193,741	226,510
Total assets	[1]	13,071,564		13,071,564		$ 12,766,320
Marketing, general and administrative		23,510	25,480	43,080	51,459
Operating Segments | Real Estate Segment
Segment information
Total revenues		213,756	261,406	489,526	515,630
Net income		40,057	140,934	151,290	162,506
Total assets		11,755,091		11,755,091		11,063,155
Operating Segments | Debt and Preferred Equity Segment
Segment information
Total revenues		39,943	51,618	78,476	101,649
Net income		26,570	$ 32,807	42,451	$ 64,004
Total assets		$ 1,316,473		$ 1,316,473		$ 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: $355.0 million and $205.2 million of land, $1.2 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, $263.1 million and $17.6 million of accumulated depreciation, $371.5 million and $169.5 million of other assets included in other line items, $444.5 million and $457.1 million of real estate debt, net, $1.0 million and $1.2 million of accrued interest payable, $58.2 million and $57.7 million of lease liabilities, and $84.9 million and $43.7 million of other liabilities included in other line items as of June 30, 2020 and December 31, 2019, respectively.