Debt and Preferred Equity Investments - Preferred Equity Investments (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Preferred equity investment
Aggregate weighted average current yield (as a percent)	6.53%
Carrying Value	$ 1,052,110	$ 1,076,542
Preferred Equity, June 2022
Preferred equity investment
Future Funding Obligations	0
Senior Financing	1,712,750
Carrying Value	159,218	154,691
Preferred Equity, February 2027
Preferred equity investment
Future Funding Obligations	0
Senior Financing	250,000
Carrying Value	$ 110,390	105,095
Preferred equity investments
Preferred equity investment
Aggregate weighted average current yield (as a percent)	9.90%
Future Funding Obligations	$ 0
Senior Financing	1,962,750
Carrying Value	269,608	259,786
Allowance for loan loss	0	0
Total after allowance for loan loss	$ 269,608	$ 259,786