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Other Investments - Schedule of Other Investments (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Other investments	$ 1,123,093		$ 1,123,093		$ 907,875
Earnings (losses) from equity method investments	6,805	$ 7,617	26,003	$ 16,566
Interest expense	42,407	46,522	127,748	136,851
Dilution gain		8,200		8,200
Mark-to-market gain	14,000		23,900
Equity in earnings		8,200		8,200
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Schedule of Equity Method Investments [Line Items]
Depreciation expense	4,600	3,500	13,400	10,700
Interest expense	$ 14,600	8,200	$ 44,000	21,600
SAFE
Schedule of Equity Method Investments [Line Items]
Number of shares owned (in shares)	33.7		33.7
Closing price (in dollars per share)	$ 62.10		$ 62.10
Market value	$ 2,100,000		$ 2,100,000
Dilution gain			7,900
Equity in earnings			7,900
Other strategic investments
Schedule of Equity Method Investments [Line Items]
Other investments	72,220		72,220		43,253
Earnings (losses) from equity method investments	205	195	(1,953)	162
Real estate equity investments
Schedule of Equity Method Investments [Line Items]
Carrying value	1,050,873		1,050,873		864,622
Earnings (losses) from equity method investments	6,600	7,422	27,956	16,404
Real estate equity investments | SAFE
Schedule of Equity Method Investments [Line Items]
Carrying value	855,925		855,925		729,357
Earnings (losses) from equity method investments	9,331	2,946	36,905	14,076
Real estate equity investments | iStar Net Lease II LLC (Net Lease Venture II)
Schedule of Equity Method Investments [Line Items]
Carrying value	103,276		103,276		30,712
Earnings (losses) from equity method investments	811	(98)	1,568	(416)
Real estate equity investments | Other real estate equity investments
Schedule of Equity Method Investments [Line Items]
Carrying value	91,672		91,672		$ 104,553
Earnings (losses) from equity method investments	$ (3,542)	$ 4,574	$ (10,517)	$ 2,744

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