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Earnings Per Share (Earnings Allocable to Common Shares) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Denominator for basic and diluted earnings per share:
Weighted average common shares outstanding for basic and diluted earnings per common share	72,065	77,060
Basic and diluted earnings per common share:
Net income (loss) attributable to iStar Inc. and allocable to common shareholders (in dollars per share)	$ (0.38)	$ (0.27)
Common Stock
Denominator for basic and diluted earnings per share:
Weighted average common shares outstanding for basic and diluted earnings per common share	72,065	77,060
Basic and diluted earnings per common share:
Income (loss) from operations attributable to iStar Inc. and allocable to common shareholders (in dollars per share)	$ (0.38)	$ (0.27)
Net income (loss) attributable to iStar Inc. and allocable to common shareholders (in dollars per share)	$ (0.38)	$ (0.27)
Basic and Diluted | Common Stock
Numerator for basic earnings per share:
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders	$ (27,102)	$ (21,187)
Net income (loss) attributable to iStar Inc. and allocable to common shareholders	$ (27,102)	$ (21,187)

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