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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 | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Denominator for basic and diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of shares, Basic (in shares) |  |  |  |  |  |  |  |  |  | 73,453 | 84,987 | 85,031
Weighted average common shares outstanding for diluted earnings per common share (in shares) |  |  |  |  |  |  |  |  |  | 98,467 | 84,987 | 85,031
Basic earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.60 | $ (0.62) | $ (0.40)
Earnings per share, basic (in dollars per share) |  |  |  |  |  |  |  |  |  | 0.60 | (0.62) | (0.40)
Diluted earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders (in dollars per share) |  |  |  |  |  |  |  |  |  | 0.55 | (0.62) | (0.40)
Net income (loss) attributable to iStar Inc. and allocable to common shareholders (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.55 | $ (0.62) | $ (0.40)
Denominator for basic and diluted earnings per HPU share: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average HPUs outstanding for basic and diluted earnings per share (in shares) | [1] |  |  |  |  |  |  |  |  | 0 | 9 | 15
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 | $ (120.00) | $ (75.27)
Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Denominator for basic and diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of shares, Basic (in shares) |  | 71,603 | 71,210 | 73,984 | 77,060 | 83,162 | 85,766 | 85,541 | 85,497 | 73,453 | 84,987 | 85,031
Add: Effect of assumed shares issued under treasury stock method or restricted stock units (in shares) |  |  |  |  |  |  |  |  |  | 84 | 0 | 0
Weighted average common shares outstanding for diluted earnings per common share (in shares) |  | 71,603 | 115,666 | 118,510 | 77,060 | 83,581 | 85,766 | 85,541 | 85,497 | 98,467 | 84,987 | 85,031
Basic earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.60 | $ (0.62) | $ (0.40)
Earnings per share, basic (in dollars per share) |  | $ (0.27) | $ 0.65 | $ 0.52 | $ (0.27) | $ 0.09 | $ (0.07) | $ (0.36) | $ (0.26) | 0.60 | (0.62) | (0.40)
Diluted earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders (in dollars per share) |  |  |  |  |  |  |  |  |  | 0.55 | (0.62) | (0.40)
Net income (loss) attributable to iStar Inc. and allocable to common shareholders (in dollars per share) |  | $ (0.27) | $ 0.44 | $ 0.37 | $ (0.27) | $ 0.09 | $ (0.07) | $ (0.36) | $ (0.26) | 0.55 | (0.62) | (0.40)
HPU's |  |  |  |  |  |  |  |  |  |  |  |
Denominator for basic and diluted earnings per HPU share: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average HPUs outstanding for basic and diluted earnings per share (in shares) |  |  |  |  |  | 0 | 7 | 15 | 15 |  |  |
Basic and diluted earnings per HPU share: |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to iStar Inc. and allocable to HPU holders (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.00 | $ (120.00) | $ (75.27)
Basic | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Numerator for basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from operations attributable to iStar Inc. and allocable to common shareholders |  |  |  |  |  |  |  |  |  | $ 43,972 | $ (52,675) | $ (33,722)
Net income (loss) attributable to iStar Inc. and allocable to common shareholders |  |  |  |  |  |  |  |  |  | 43,972 | (52,675) | (33,722)
Diluted | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Numerator for basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from operations attributable to iStar Inc. and allocable to common shareholders |  |  |  |  |  |  |  |  |  | 54,126 | (52,675) | (33,722)
Net income (loss) attributable to iStar Inc. and allocable to common shareholders |  |  |  |  |  |  |  |  |  | 54,126 | (52,675) | (33,722)
Basic and Diluted | HPU's |  |  |  |  |  |  |  |  |  |  |  |
Numerator for basic and diluted earnings per HPU share: |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to iStar Inc. and allocable to HPU holders |  |  |  |  |  |  |  |  |  | $ 0 | $ (1,080) | $ (1,129)
Denominator for basic and diluted earnings per HPU share: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average HPUs outstanding for basic and diluted earnings per share (in shares) |  |  |  |  |  |  |  |  |  | 0 | 9 | 15
Joint venture shares | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Denominator for basic and diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Add: Effect of joint venture shares (in shares) |  |  |  |  |  |  |  |  |  | 298 | 0 | 0
1.50% convertible senior unsecured notes | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Denominator for basic and diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Add: Effect of senior convertible unsecured notes (in shares) |  |  |  |  |  |  |  |  |  | 9,868 | 0 | 0
3.00% convertible senior unsecured notes | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Denominator for basic and diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Add: Effect of senior convertible unsecured notes (in shares) |  |  |  |  |  |  |  |  |  | 14,764 | 0 | 0
[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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