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Other Investments - Schedule of Other Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Other investments	$ 521,999		$ 304,275
Equity in earnings (losses)	5,309	$ 3,332
Other strategic investments
Schedule of Equity Method Investments [Line Items]
Other investments	7,227		7,516
Equity in earnings (losses)	202	(494)
Real estate equity investments
Schedule of Equity Method Investments [Line Items]
Carrying value	514,772		296,759
Equity in earnings (losses)	5,107	3,826
Real estate equity investments | Safehold Inc. (SAFE)
Schedule of Equity Method Investments [Line Items]
Carrying value	402,052		149,589
Equity in earnings (losses)	7,316	1,472
Real estate equity investments | iStar Net Lease II LLC (Net Lease Venture II)
Schedule of Equity Method Investments [Line Items]
Carrying value	5,630		16,215
Equity in earnings (losses)	(86)	0
Real estate equity investments | iStar Net Lease I LLC (Net Lease Venture)
Schedule of Equity Method Investments [Line Items]
Carrying value	0		0
Equity in earnings (losses)	0	2,084
Real estate equity investments | Other real estate equity investments
Schedule of Equity Method Investments [Line Items]
Carrying value	107,090		$ 130,955
Equity in earnings (losses)	$ (2,123)	$ 270

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- Definition

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