Debt and Preferred Equity Investments - Preferred Equity Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Preferred equity investment
Aggregate weighted average current yield (as a percent)	5.90%
Carrying Value	$ 1,097,202	$ 1,076,542
Preferred Equity, June 2022
Preferred equity investment
Future Funding Obligations	0
Senior Financing	1,712,750
Carrying Value	156,169	154,691
Preferred Equity, February 2027
Preferred equity investment
Future Funding Obligations	0
Senior Financing	250,000
Carrying Value	$ 106,812	105,095
Preferred equity investments
Preferred equity investment
Aggregate weighted average current yield (as a percent)	9.94%
Future Funding Obligations	$ 0
Senior Financing	1,962,750
Carrying Value	262,981	259,786
Allowance for loan loss	0	0
Total after allowance for loan loss	$ 262,981	$ 259,786