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Investments (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Sep. 08, 2017
Schedule of Equity Method Investments
(Loss) income from equity method investments	$ (1,000,000.0)	$ (4,100,000)	$ 0	$ (4,116,000)
Distributions received	0	0	0	0
Equity method investment	88,315,000		88,315,000		$ 88,315,000
Unrealized gain (loss) on marketable securities	2,500,000	$ (10,000,000.0)	2,500,000	$ (26,800,000)
Other Assets
Schedule of Equity Method Investments
Equity method investment	88,300,000		88,300,000		88,300,000
Debt securities	$ 26,400,000		$ 26,400,000		$ 9,900,000
CF Real Estate Finance Holdings, L.P.
Schedule of Equity Method Investments
Equity method investment ownership percentage (in percentage)	27.00%		27.00%
Equity method investment						$ 100,000,000.0

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