Investments (Details)	1 Months Ended	3 Months Ended		6 Months Ended
	Dec. 31, 2022 USD ($) d	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jul. 20, 2022 USD ($)	Sep. 08, 2017 USD ($)
Schedule of Equity Method Investments
Equity income of subsidiaries		$ 5,000,000	$ 0	$ 8,535,000	$ 0
Equity method investment	$ 91,300,000	99,800,000		99,800,000
Unrealized gain (loss)			(15,500,000)	0	(13,945,000)
Realized gain (loss) on marketable securities		0	0	0	1,600,000
Payments to acquire investments			$ 300,000		$ 2,700,000
Debt securities	$ 8,688,000	7,691,000		7,691,000
Maximum
Schedule of Equity Method Investments
Unrealized gain (loss)		$ 1,000,000		$ (1,000,000)
Cantor | Corporate Joint Venture
Schedule of Equity Method Investments
Equity method investment, expected redemption proceeds						$ 88,400,000
CF Real Estate Finance Holdings, L.P.
Schedule of Equity Method Investments
Equity method investment ownership percentage		27.00%		27.00%
Equity method investment							$ 100,000,000
Rescission of ownership percentage by parent	27.20%
Redemption notice, threshold trading days | d	20
Payment for administrative fees	$ 44,000