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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Denominator for basic and diluted earnings per share: |  |  |  |  |
Weighted average common shares outstanding for basic and diluted earnings per common share (in shares) |  | 73,984 | 85,541 | 75,522 | 85,519
Weighted average common shares outstanding for diluted earnings per common share (in shares) |  | 118,510 | 85,541 | 104,431 | 85,519
Basic earnings per common share: |  |  |  |  |
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders (in dollars per share) |  | $ 0.52 | $ (0.36) | $ 0.22 | $ (0.63)
Diluted earnings per common share: |  |  |  |  |
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders (in dollars per share) |  | 0.37 | (0.36) | 0.22 | (0.63)
Net income (loss) attributable to iStar Inc. and allocable to common shareholders (in dollars per share) |  | $ 0.37 | $ (0.36) | $ 0.22 | $ (0.63)
Denominator for basic and diluted earnings per HPU share: |  |  |  |  |
Weighted average High Performance Units outstanding for basic and diluted earnings per share (in shares) | [1] | 0 | 15 | 0 | 15
Basic and diluted earnings per HPU share: |  |  |  |  |
Net income (loss) attributable to iStar Inc. and allocable to HPU holders | [1] | $ 0.00 | $ (68.47) | $ 0.00 | $ (118.40)
Undistributed earnings (loss) allocated to participating securities, basic |  | $ 20 |  |  |
Undistributed earnings (loss) allocated to participating securities, diluted |  | $ 14 |  | $ 11 |
Common Stock |  |  |  |  |
Denominator for basic and diluted earnings per share: |  |  |  |  |
Weighted average common shares outstanding for basic and diluted earnings per common share (in shares) |  | 73,984 | 85,541 | 75,522 | 85,519
Add: Effect of assumed shares issued under treasury stock method for restricted shares (in shares) |  | 34 | 0 | 52 | 0
Weighted average common shares outstanding for diluted earnings per common share (in shares) |  | 118,510 | 85,541 | 104,431 | 85,519
Basic earnings per common share: |  |  |  |  |
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders (in dollars per share) |  | $ 0.52 | $ (0.36) | $ 0.22 | $ (0.63)
Net income (loss) attributable to iStar Inc. and allocable to common shareholders (in dollars per share) |  | 0.52 | (0.36) | 0.22 | (0.63)
Diluted earnings per common share: |  |  |  |  |
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders (in dollars per share) |  | 0.37 | (0.36) | 0.22 | (0.63)
Net income (loss) attributable to iStar Inc. and allocable to common shareholders (in dollars per share) |  | $ 0.37 | $ (0.36) | $ 0.22 | $ (0.63)
HPU's |  |  |  |  |
Numerator for basic and diluted earnings per HPU share: |  |  |  |  |
Net income (loss) attributable to iStar Inc. and allocable to HPU holders |  | $ 0 |  |  |
Denominator for basic and diluted earnings per HPU share: |  |  |  |  |
Weighted average High Performance Units outstanding for basic and diluted earnings per share (in shares) |  | 0 | 15 | 0 | 15
Basic and diluted earnings per HPU share: |  |  |  |  |
Net income (loss) attributable to iStar Inc. and allocable to HPU holders |  | $ 0.00 | $ (68.47) | $ 0.00 | $ (118.40)
Basic | Common Stock |  |  |  |  |
Numerator for basic earnings per share: |  |  |  |  |
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders |  | $ 38,112 | $ (30,950) | $ 16,933 | $ (53,502)
Net income (loss) attributable to iStar Inc. and allocable to common shareholders |  | 38,112 | (30,950) | 16,933 | (53,502)
Basic | HPU's |  |  |  |  |
Numerator for basic and diluted earnings per HPU share: |  |  |  |  |
Net income (loss) attributable to iStar Inc. and allocable to HPU holders |  |  |  | 0 |
Basic and Diluted [Member] | HPU's |  |  |  |  |
Numerator for basic and diluted earnings per HPU share: |  |  |  |  |
Net income (loss) attributable to iStar Inc. and allocable to HPU holders |  |  | (1,027) |  | (1,776)
Diluted | Common Stock |  |  |  |  |
Numerator for basic earnings per share: |  |  |  |  |
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders |  | 43,293 | (30,950) | 22,774 | (53,502)
Net income (loss) attributable to iStar Inc. and allocable to common shareholders |  | $ 43,293 | $ (30,950) | $ 22,774 | $ (53,502)
Joint venture shares | Common Stock |  |  |  |  |
Denominator for basic and diluted earnings per share: |  |  |  |  |
Add: Effect of joint venture shares (in shares) |  | 298 | 0 | 298 | 0
1.50% convertible senior unsecured notes |  |  |  |  |
Basic and diluted earnings per HPU share: |  |  |  |  |
Stated interest rates |  | 1.50% | 1.50% | 1.50% | 1.50%
1.50% convertible senior unsecured notes | Common Stock |  |  |  |  |
Denominator for basic and diluted earnings per share: |  |  |  |  |
Add: Effect of senior unsecured notes (in shares) |  | 11,567 | 0 | 11,567 | 0
3.00% convertible senior unsecured notes |  |  |  |  |
Basic and diluted earnings per HPU share: |  |  |  |  |
Stated interest rates |  | 3.00% | 3.00% | 3.00% | 3.00%
3.00% convertible senior unsecured notes | Common Stock |  |  |  |  |
Denominator for basic and diluted earnings per share: |  |  |  |  |
Add: Effect of senior unsecured notes (in shares) |  | 16,992 | 0 | 16,992 | 0
Preferred Stock Series J | Common Stock |  |  |  |  |
Denominator for basic and diluted earnings per share: |  |  |  |  |
Add: Effect of series J convertible perpetual preferred stock (in shares) |  | 15,635 | 0 | 0 | 0
[1] | All of the Company's outstanding High Performance Units ("HPUs") were repurchased and retired on August 13, 2015 (refer to Note 15)

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