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Earnings Per Share (Schedule of Earnings Per Share) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Income (loss) from continuing operations | $ (40,198) | $ (23,384) | $ (115,050)
Income from sales of real estate | 92,049 | 105,296 | 93,816
Net (income) loss attributable to noncontrolling interests | (4,526) | (4,876) | 3,722
Preferred dividends | (48,444) | (51,320) | (51,320)
Premium above book value on redemption of preferred stock | (16,314) | 0 | 0
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders, HPU holders and Participating Security Holders for basic earnings per common share | (17,433) | 25,716 | (68,832)
Income (loss) from continuing operations attributable to iStar Inc. and allocable to common shareholders, HPU holders and Participating Security Holders for diluted earnings per common share | (17,433) | 25,723 | (68,832)
Undistributed earnings (loss) allocated to participating securities, basic |  | 8 |
Undistributed earnings (loss) allocated to participating securities, diluted |  | 8 |
Joint venture shares |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Dilutive securities, effect on basic earnings per share, dilutive convertible securities | $ 0 | $ 7 | $ 0

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- Definition The income or loss from continuing operations during the period which is attributable to the parent and is available to common shareholders, HPU holders and Participating Security holders. + References No definition available. + Details
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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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