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Other Investments (Schedule of Other Investments) (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Other investments	[1]	$ 1,526,019		$ 1,297,281
Earnings (losses) from equity method investments		25,032	$ 11,768
Interest expense		29,243	28,809
Mark-to-market gain		$ 5,100
Safehold Inc.
Schedule of Equity Method Investments [Line Items]
Number of shares owned (in shares)		40.1
Closing price (in dollars per share)		$ 55.45
Market value		$ 2,200,000
Dilution gain		900	500
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Other investments		1,526,019		1,297,281
Earnings (losses) from equity method investments		25,032	11,768
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Other strategic investments
Schedule of Equity Method Investments [Line Items]
Other investments		29,373		66,770
Earnings (losses) from equity method investments		3,623	958
Real estate equity investments | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Carrying value		1,496,646		1,230,511
Earnings (losses) from equity method investments		21,409	10,810
Real estate equity investments | Equity Method Investment, Nonconsolidated Investee or Group of Investees | Safehold Inc.
Schedule of Equity Method Investments [Line Items]
Carrying value		1,388,657		1,168,532
Earnings (losses) from equity method investments		17,029	11,412
Real estate equity investments | Equity Method Investment, Nonconsolidated Investee or Group of Investees | Ground Lease Plus Fund
Schedule of Equity Method Investments [Line Items]
Carrying value		64,548		17,630
Earnings (losses) from equity method investments		769
Real estate equity investments | Equity Method Investment, Nonconsolidated Investee or Group of Investees | Other real estate equity investments
Schedule of Equity Method Investments [Line Items]
Carrying value		43,441		$ 44,349
Earnings (losses) from equity method investments		$ 3,611	$ (602)
[1] Refer to Note 2 for details on the Company’s consolidated variable interest entities (“VIEs”).

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