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Earnings Per Share (Schedule of Earnings Per Share) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Income (loss) from continuing operations	$ (18,326)	$ 51,851	$ 81,912
Net income attributable to noncontrolling interests	(13,936)	(4,526)	(4,876)
Preferred dividends	(32,495)	(48,444)	(51,320)
Premium above book value on redemption of preferred stock	0	(16,314)	0
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders, HPU holders and Participating Security Holders for basic earnings per common share	(64,757)	(17,433)	25,716
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders, HPU holders and Participating Security Holders for diluted earnings per common share	(64,757)	(17,433)	25,723
Income allocable to participating securities, basic			8
Income allocable to participating securities, diluted			8
Joint venture shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive securities, effect on basic earnings per share, dilutive convertible securities	$ 0	$ 0	$ 7

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