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Earnings Per Share (Earnings Allocable to Common Shares) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Numerator for basic earnings per share: |  |  |  |
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders |  | $ (17,433) | $ 25,708 | $ (67,449)
Income from discontinued operations |  | 4,939 | 18,264 | 14,774
Gain from discontinued operations |  | 123,418 | 0 | 0
Net income (loss) allocable to common shareholders |  | 110,924 | 43,972 | (52,675)
Numerator for diluted earnings per share: |  |  |  |
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders |  | (17,433) | 25,715 | (67,449)
Income from discontinued operations |  | 4,939 | 18,264 | 14,774
Gain from discontinued operations |  | 123,418 | 0 | 0
Net income (loss) attributable to iStar Inc. and allocable to common shareholders |  | $ 110,924 | $ 43,979 | $ (52,675)
Denominator for basic and diluted earnings per share: |  |  |  |
Weighted average number of shares, Basic (in shares) |  | 71,021 | 73,453 | 84,987
Add: Effect of assumed shares issued under treasury stock method or restricted stock units (in shares) |  | 0 | 84 | 0
Add: Effect of joint venture shares (in shares) |  | 0 | 298 | 0
Weighted average common shares outstanding for diluted earnings per common share (in shares) |  | 71,021 | 73,835 | 84,987
Basic earnings per common share: |  |  |  |
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders (in dollars per share) |  | $ (0.25) | $ 0.35 | $ (0.79)
Income from discontinued operations (in dollars per share) |  | 0.07 | 0.25 | 0.17
Gain from discontinued operations (in dollars per share) |  | 1.74 | 0.00 | 0.00
Earnings per share, basic (in dollars per share) |  | 1.56 | 0.60 | (0.62)
Diluted earnings per common share: |  |  |  |
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders (in dollars per share) |  | (0.25) | 0.35 | (0.79)
Income from discontinued operations (in dollars per share) |  | 0.07 | 0.25 | 0.17
Gain from discontinued operations (in dollars per share) |  | 1.74 | 0.00 | 0.00
Net income (loss) attributable to iStar Inc. and allocable to common shareholders (in dollars per share) |  | $ 1.56 | $ 0.60 | $ (0.62)
Denominator for basic and diluted earnings per HPU share: |  |  |  |
Weighted average number of HPU share—Basic and diluted (in shares) | [1] | 0 | 0 | 9
Basic and diluted earnings per HPU share: |  |  |  |
Net income (loss) attributable to iStar Inc. and allocable to HPU holders (in dollars per share) | [1] | $ 0.00 | $ 0.00 | $ (153.67)
HPU's |  |  |  |
Numerator for basic and diluted earnings per HPU share: |  |  |  |
Income (loss) from continuing operations attributable to iStar Inc. and allocable to HPU holders |  | $ 0 | $ 0 | $ (1,383)
Income from discontinued operations |  | 0 | 0 | 303
Net income (loss) attributable to iStar Inc. and allocable to HPU holders |  | $ 0 | $ 0 | $ (1,080)
Denominator for basic and diluted earnings per HPU share: |  |  |  |
Weighted average number of HPU share—Basic and diluted (in shares) |  | 0 | 0 | 9
Basic and diluted earnings per HPU share: |  |  |  |
Income (loss) from continuing operations attributable to iStar Inc. and allocable to HPU holders |  | $ 0.00 | $ 0.00 | $ (153.67)
Income from discontinued operations |  | 0.00 | 0.00 | 33.67
Net income (loss) attributable to iStar Inc. and allocable to HPU holders (in dollars per share) |  | $ 0.00 | $ 0.00 | $ (120.00)
[1] | All of the Company's outstanding High Performance Units ("HPUs") were repurchased and retired on August 13, 2015 (refer to Note 13).

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