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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, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ 172,025 | $ 120,487 | $ 109,185 | $ 112,857 | $ 109,950 | $ 113,486 | $ 129,843 | $ 108,749 | $ 514,554 | $ 462,028 | $ 390,790
Net income (loss) |  | 19,974 | 5,958 | (19,776) | (12,313) | (1,955) | 35,491 | (3,594) | (14,177) | (6,157) | 15,765 | (111,233)
Earnings per common share data: |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to iStar Inc. |  |  |  |  |  |  |  |  |  | $ (2,435) | $ 16,469 | $ (111,951)
Earnings per share, basic and diluted (in dollars per share) | [1] |  |  |  |  |  |  |  |  | $ (0.62) | $ (0.40) | $ (1.83)
Earnings per HPU share data: |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) attributable to iStar Inc. from continuing operations—basic and diluted (in dollars per share) | [1] |  |  |  |  |  |  |  |  | $ (0.62) | $ (0.40) | $ (2.09)
Weighted average number of HPU shares—basic and diluted | [1],[2] |  |  |  |  |  |  |  |  | 9 | 15 | 15
Undistributed earnings (loss) allocated to participating securities, Basic |  | 5 |  |  |  |  | 2 |  |  |  |  |
Undistributed earnings (loss) allocated to participating securities, Diluted |  | 5 |  |  |  |  | 2 |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Earnings per common share data: |  |  |  |  |  |  |  |  |  |  |  |
Earnings per share, basic and diluted (in dollars per share) |  |  |  |  |  |  |  |  |  | $ (0.62) | $ (0.40) | $ (1.83)
Earnings per HPU share data: |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) attributable to iStar Inc. from continuing operations—basic and diluted (in dollars per share) |  |  |  |  |  |  |  |  |  | (0.62) | (0.40) | (2.09)
HPU |  |  |  |  |  |  |  |  |  |  |  |
Earnings per common share data: |  |  |  |  |  |  |  |  |  |  |  |
Earnings per share, basic and diluted (in dollars per share) |  |  |  |  |  |  |  |  |  | (120.00) | (75.27) | (346.80)
Earnings per HPU share data: |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) attributable to iStar Inc. from continuing operations—basic and diluted (in dollars per share) |  |  |  |  |  |  |  |  |  | $ (120.00) | $ (75.27) | $ (396.07)
Weighted average number of HPU shares—basic and diluted |  |  |  |  |  |  |  |  |  | 9 | 15 | 15
Basic | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Earnings per common share data: |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to iStar Inc. |  | $ 7,685 | $ (6,072) | $ (30,950) | $ (22,553) | $ (13,270) | $ 22,327 | $ (16,207) | $ (26,572) |  |  |
Earnings per share, Basic (in dollars per share) |  |  |  |  |  | $ (0.16) | $ 0.26 | $ (0.19) | $ (0.31) |  |  |
Weighted average number of shares, Basic |  | 83,162 | 85,766 | 85,541 | 85,497 | 85,188 | 85,163 | 84,916 | 84,819 |  |  |
Basic | HPU |  |  |  |  |  |  |  |  |  |  |  |
Earnings per HPU share data: |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to iStar Inc. |  |  |  |  |  | $ (442) | $ 744 | $ (542) | $ (889) |  |  |
Earnings per share, Basic (in dollars per share) |  |  |  |  |  | $ (29.47) | $ 49.60 | $ (36.13) | $ (59.27) |  |  |
Diluted | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Earnings per common share data: |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to iStar Inc. |  | $ 7,684 | $ (6,072) | $ (30,950) | $ (22,553) | $ (13,270) | $ 27,608 | $ (16,207) | $ (26,572) |  |  |
Earnings per share, Diluted (in dollars per share) |  |  |  |  |  | $ (0.16) | $ 0.21 | $ (0.19) | $ (0.31) |  |  |
Weighted average number of shares, Diluted |  | 83,581 | 85,766 | 85,541 | 85,497 | 85,188 | 130,160 | 84,916 | 84,819 |  |  |
Diluted | HPU |  |  |  |  |  |  |  |  |  |  |  |
Earnings per HPU share data: |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to iStar Inc. |  |  |  |  |  | $ (442) | $ 602 | $ (542) | $ (889) |  |  |
Earnings per share, Diluted (in dollars per share) |  |  |  |  |  | $ (29.47) | $ 40.13 | $ (36.13) | $ (59.27) |  |  |
Basic and Diluted | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Earnings per common share data: |  |  |  |  |  |  |  |  |  |  |  |
Earnings per share, basic and diluted (in dollars per share) |  | $ 0.09 | $ (0.07) | $ (0.36) | $ (0.26) |  |  |  |  |  |  |
Earnings per HPU share data: |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to iStar Inc. |  | $ 0 | $ (94) | $ (1,027) | $ (749) |  |  |  |  |  |  |
Income (loss) attributable to iStar Inc. from continuing operations—basic and diluted (in dollars per share) |  | $ 0.00 | $ (13.41) | $ (68.47) | $ (49.93) |  |  |  |  |  |  |
Basic and Diluted | HPU |  |  |  |  |  |  |  |  |  |  |  |
Earnings per HPU share data: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of HPU shares—basic and diluted |  | 0 | 7 | 15 | 15 | 15 | 15 | 15 | 15 |  |  |
[1] | Income (loss) from continuing operations attributable to iStar Inc. was $(96.3) million, $(73.5) million and $(221.5) million for the years ended December 31, 2015, 2014 and 2013, respectively. Refer to Note 15 for details on the calculation of earnings per share.
[2] | 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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