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Quarterly Financial Information (Unaudited) (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended | 3 Months Ended |  | 12 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Unsecured Notes 8.625% senior notes | Mar. 31, 2011 Secured Notes 10.0% senior notes due 2014 | Jan. 02, 2011 Secured Notes 10.0% senior notes due 2014 | Dec. 31, 2011 Non-performing Loans | Mar. 31, 2012 Madison Funds | Dec. 31, 2012 Madison Funds | Dec. 31, 2011 Madison Funds | Dec. 31, 2010 Madison Funds | Oct. 31, 2011 Oak Hill Advisors
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 93,713,000 | [1] | $ 95,159,000 | $ 108,647,000 | $ 102,953,000 | $ 104,731,000 | [2] | $ 105,841,000 | $ 136,610,000 | $ 117,887,000 | $ 400,472,000 |  | $ 465,069,000 |  | $ 601,457,000 |  |  |  |  |  |  |  |  |  |
Net income (loss) | (79,948,000) | [1] | (64,306,000) | (51,129,000) | (46,048,000) | (28,915,000) | [2] | (54,661,000) | (26,020,000) | 83,902,000 | (241,430,000) |  | (25,693,000) |  | 80,206,000 |  |  |  |  |  |  |  |  |  |
Earnings per common share data: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to iStar Financial Inc. | (87,424,000) | [1] | (71,784,000) | (58,996,000) | (54,792,000) | (35,202,000) | [2] | (62,231,000) | (35,525,000) | 67,420,000 | (272,997,000) |  | (62,387,000) |  | 36,279,000 |  |  |  |  |  |  |  |  |  |
Basic earnings per share (in dollars per share) | $ (1.04) | [1] | $ (0.86) | $ (0.70) | $ (0.66) | $ (0.43) | [2] | $ (0.71) | $ (0.38) | $ 0.73 | $ (3.26) |  | $ (0.70) |  | $ 0.39 |  |  |  |  |  |  |  |  |  |
Diluted earnings per share (in dollars per share) | $ (1.04) | [1] | $ (0.86) | $ (0.70) | $ (0.66) | $ (0.43) | [2] | $ (0.71) | $ (0.38) | $ 0.71 | $ (3.26) |  | $ (0.70) |  | $ 0.39 |  |  |  |  |  |  |  |  |  |
Weighted average number of common shares—basic | 83,674 | [1] | 83,629 | 84,113 | 83,556 | 81,769 | [2] | 87,951 | 92,621 | 92,458 | 83,742 |  | 88,688 |  | 93,244 |  |  |  |  |  |  |  |  |  |
Weighted average number of common shares—diluted | 83,674 | [1] | 83,629 | 84,113 | 83,556 | 81,769 | [2] | 87,951 | 92,621 | 94,609 | 83,742 |  | 88,688 |  | 93,244 |  |  |  |  |  |  |  |  |  |
Earnings per HPU share data: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to iStar Financial Inc. | (2,966,000) | [1] | (2,436,000) | (1,991,000) | (1,861,000) | (1,222,000) | [2] | (2,008,000) | (1,089,000) | 2,070,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share (in dollars per share) | $ (197.73) | [1] | $ (162.40) | $ (132.73) | $ (124.07) | $ (81.47) | [2] | $ (133.87) | $ (72.60) | $ 138.00 | $ (616.87) | [3],[4] | $ (133.13) | [3],[4] | $ 72.27 | [3],[4] |  |  |  |  |  |  |  |  |
Diluted earnings per share (in dollars per share) | $ (197.73) | [1] | $ (162.40) | $ (132.73) | $ (124.07) | $ (81.47) | [2] | $ (133.87) | $ (72.60) | $ 135.07 | $ (616.87) | [3],[4] | $ (133.13) | [3],[4] | $ 72.27 | [3],[4] |  |  |  |  |  |  |  |  |
Weighted average number of HPU shares—basic and diluted | 15 | [1] | 15 | 15 | 15 | 15 | [2] | 15 | 15 | 15 | 15 | [3],[4] | 15 | [3],[4] | 15 | [3],[4] |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on early extinguishment of debt, net |  |  |  |  |  |  |  |  |  |  | (37,816,000) |  | 101,466,000 |  | 108,923,000 |  | 31,000,000 | 109,000,000 |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.625% |  | 10.00% |  |  |  |  |  |
Income from sales of residential property |  |  |  |  | 27,900,000 |  |  |  |  |  | 63,472,000 |  | 5,721,000 |  | 0 |  |  |  |  |  |  |  |  |  |
Earnings from equity method investments |  |  |  |  |  |  |  |  |  |  | 103,009,000 |  | 95,091,000 |  | 51,908,000 |  |  |  |  |  | 13,700,000 | 10,246,000 | 3,641,000 | 9,717,000 |
Net gain from sale of ownership interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,300,000
Impaired financing receivable, interest income, cash basis method |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26,300,000 |  |  |  |  |
Amount of debt extinguished |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 312,300,000 |  |  |  |  |  |  |
[1] | During the quarter ended December 31, 2012, the Company recorded a loss on early extinguishment of debt of $31.0 million primarily related to a prepayment penalty on the early repayment of 8.625% Senior Notes, as well as a loss due to the acceleration of unamortized fees and discounts related to the refinancing of the 2011 Secured Credit Facilities (see Note 8). The Company also recorded $27.9 million related to Income from sales of residential property. During the quarter ended March 31, 2012, the Madison Funds recorded a significant gain related to the sale of an investment for which the Company recorded its $13.7 million proportionate share.
[2] | During the quarter ended December 31, 2011, the Company sold a substantial portion of its interests in Oak Hill Advisors, L.P. and related entities which resulted in a net gain of $30.3 million (see Note 6). During the quarter ended June 30, 2011, the Company recorded interest income of $26.3 million related to certain non-performing loans that were resolved, including interest not previously recorded due to the loans being on non-accrual status. During the quarter ended March 31, 2011, the Company recorded a gain on early extinguishment of debt of $109.0 million for the redemption of its $312.3 million remaining principal amount of 10% senior secured notes due June 2014.
[3] | Income (loss) from continuing operations attributable to iStar Financial Inc. for the years ended December 31, 2012, 2011 and 2010 was $(311.2) million, $(45.6) million and $(207.5) million, respectively. See Note 13 for details on the calculation of earnings per share.
[4] | HPU holders are current and former Company employees who purchased high performance common stock units under the Company's High Performance Unit Program (see Note 11).

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