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Other Investments (Schedule of Other Investments) (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Other investments	$ 1,297,281	$ 1,097,562
Earnings (losses) from equity method investments	154,344	39,472	$ 42,378
Interest expense	115,400	126,828	141,699
Mark-to-market gain	$ 18,900	23,900
Safehold Inc.
Schedule of Equity Method Investments [Line Items]
Number of shares owned (in shares)	36.6
Closing price (in dollars per share)	$ 79.85
Market value	$ 2,900,000
Dilution gain	60,700	14,400	7,600
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Other strategic investments
Schedule of Equity Method Investments [Line Items]
Other investments	66,770	69,911
Earnings (losses) from equity method investments	9,345	(1,075)	(6)
Real estate equity investments
Schedule of Equity Method Investments [Line Items]
Carrying value	1,230,511	1,027,651
Earnings (losses) from equity method investments	144,999	40,547	42,384
Real estate equity investments | Safehold Inc.
Schedule of Equity Method Investments [Line Items]
Carrying value	1,168,532	937,712
Earnings (losses) from equity method investments	108,393	53,476	29,764
Real estate equity investments | Other real estate equity investments
Schedule of Equity Method Investments [Line Items]
Carrying value	61,979	89,939
Earnings (losses) from equity method investments	$ 36,606	$ (12,929)	$ 12,620

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