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Quarterly Financial Information (Unaudited) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Revenue $ 140,165 $ 122,141 $ 171,571 $ 364,245 $ 103,144 $ 119,872 $ 347,867 $ 108,319 $ 798,122 $ 679,202 $ 455,187
Income from discontinued operations         0 0 (173) (4,766) 0 4,939 18,270
Net income (loss) (105,028) (8,832) 60,506 35,028 3,290 (3,716) 196,007 (15,372) (18,326) 180,208 100,182
Net income (loss) attributable to common shareholders (107,332) (10,860) 50,997 34,933 3,214 (3,556) 190,297 (14,272) (32,262) 175,682 95,306
Earnings per common share data:                      
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders (115,455) (18,984) 42,873 26,809 (4,910) (34,530)     (64,757) (17,433) 25,708
Net Income (Loss) Available to Common Stockholders, Basic             177,467 (27,102) (64,757) 110,924 43,972
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders $ (115,455) $ (18,984) $ 45,123 $ 29,059         (64,757) (17,433) 25,715
Net income (loss) attributable to iStar Inc., diluted         $ (4,910) $ (34,530)          
Net Income (Loss) Available to Common Stockholders, Diluted             $ 179,722 $ (27,102) $ (64,757) $ 110,924 $ 43,979
Basic (in dollars per share) $ (1.70) $ (0.28) $ 0.63 $ 0.39 $ (0.07) $ (0.48) $ 2.46 $ (0.38) $ (0.95) $ 1.56 $ 0.60
Diluted (in dollars per share) $ (1.70) $ (0.28) $ 0.54 $ 0.35 $ (0.07) $ (0.48) $ 2.04 $ (0.38) $ (0.95) $ 1.56 $ 0.60
Weighted average number of shares, Basic (in shares) 68,012 67,975 67,932 67,913 68,200 71,713 72,142 72,065 67,958 71,021 73,453
Weighted average number of shares, Diluted (in shares) 68,012 67,975 83,694 83,670 68,200 71,713 88,195 72,065 67,958 71,021 73,835