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Earnings Per Share (Schedule of Earnings Per Share) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Income (loss) from continuing operations	$ 334,325	$ (18,326)	$ 51,851
Net income attributable to noncontrolling interests	(10,283)	(13,936)	(4,526)
Preferred dividends	(32,495)	(32,495)	(48,444)
Premium above book value on redemption of preferred stock	0	0	(16,314)
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders for basic earnings per common share	291,547	(64,757)	(17,433)
Add: Effect of Series J convertible perpetual preferred stock	9,000	0	0
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders for diluted earnings per common share	$ 300,547	$ (64,757)	$ (17,433)

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