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Fair Values - (Carrying Value and Fair Value of Financial Instruments) (Details) - USD ($) $ in Thousands, shares in Millions	Sep. 30, 2023	Dec. 31, 2022
Book and estimated fair values of financial instruments
Equity method investments	$ 240,986	$ 587,138
Safehold Inc.
Book and estimated fair values of financial instruments
Equity method investments	$ 240,703	554,733
Number of shares owned (in shares)	13.5
Carrying Value
Book and estimated fair values of financial instruments
Loans receivable and other lending investments	$ 20	49
Loans receivable held for sale	0	38
Cash and cash equivalents	46	4
Restricted cash	6	3
Debt obligations, net	213
Carrying Value | Safehold Inc.
Book and estimated fair values of financial instruments
Equity method investments	241
Fair Value
Book and estimated fair values of financial instruments
Loans receivable and other lending investments	17	46
Loans receivable held for sale	0	38
Cash and cash equivalents	46	4
Restricted cash	6	$ 3
Debt obligations, net	213
Fair Value | Safehold Inc.
Book and estimated fair values of financial instruments
Equity method investments	$ 241

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