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Other Investments - Schedule of Other Investments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Other investments	$ 564,170		$ 564,170		$ 304,275
Equity in earnings (losses)	3,640	$ (7,278)	8,949	$ (3,946)
Other strategic investments
Schedule of Equity Method Investments [Line Items]
Other investments	43,955		43,955		7,516
Equity in earnings (losses)	(235)	(9,679)	(33)	(10,173)
Impairment on foreign equity method investment		10,000		10,000
Real estate equity investments
Schedule of Equity Method Investments [Line Items]
Carrying value	520,215		520,215		296,759
Equity in earnings (losses)	3,875	2,401	8,982	6,227
Real estate equity investments | SAFE
Schedule of Equity Method Investments [Line Items]
Carrying value	402,860		402,860		149,589
Equity in earnings (losses)	3,814	680	11,130	2,152
Real estate equity investments | iStar Net Lease II LLC (Net Lease Venture II)
Schedule of Equity Method Investments [Line Items]
Carrying value	5,397		5,397		16,215
Equity in earnings (losses)	(232)	0	(318)	0
Real estate equity investments | iStar Net Lease I LLC (Net Lease Venture)
Schedule of Equity Method Investments [Line Items]
Carrying value	0		0		0
Equity in earnings (losses)	0	2,016	0	4,100
Real estate equity investments | Other real estate equity investments
Schedule of Equity Method Investments [Line Items]
Carrying value	111,958		111,958		$ 130,955
Equity in earnings (losses)	$ 293	$ (295)	$ (1,830)	$ (25)

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