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Earnings Per Share (Schedule of Earnings Per Share) (Details 2) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Numerator for basic and diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain from discontinued operations |  |  |  |  |  |  |  |  | $ 0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  | $ 22,233us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  | $ 27,257us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |
Denominator for basic and diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Number of Shares Outstanding, Basic and Diluted |  |  |  |  |  |  |  |  | 85,031us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | [1] | 84,990us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | [1] | 83,742us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | [1]
Weighted average High Performance Units outstanding for basic and diluted earnings per share |  |  |  |  |  |  |  |  | 15star_WeightedAverageNumberOfHpuSharesOutstandingBasicAndDiluted | [1],[2] | 15star_WeightedAverageNumberOfHpuSharesOutstandingBasicAndDiluted | [1],[2] | 15star_WeightedAverageNumberOfHpuSharesOutstandingBasicAndDiluted | [1],[2]
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) attributable to iStar Financial Inc. from continuing operations—Basic and diluted (in dollars per share) |  |  |  |  |  |  |  |  | $ (0.40)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | [1] | $ (2.09)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | [1] | $ (3.37)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare | [1]
Earnings Per Share, Basic and Diluted (in dollars per share) |  |  |  |  |  |  |  |  | $ (0.40)us-gaap_EarningsPerShareBasicAndDiluted | [1] | $ (1.83)us-gaap_EarningsPerShareBasicAndDiluted | [1] | $ (3.26)us-gaap_EarningsPerShareBasicAndDiluted | [1]
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Denominator for basic and diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Number of Shares Outstanding, Basic and Diluted |  |  |  |  |  |  |  |  | 85,031us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  | 84,990us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  | 83,742us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) attributable to iStar Financial Inc. from continuing operations—Basic and diluted (in dollars per share) |  |  |  |  |  |  |  |  | $ (0.40)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  | $ (2.09)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  | $ (3.37)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic and Diluted Share |  |  |  |  |  |  |  |  | $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  | $ 0.01us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  | $ (0.20)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Per Basic and Diluted Share |  |  |  |  |  |  |  |  | $ 0.00us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicAndDilutedShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  | $ 0.25us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicAndDilutedShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  | $ 0.31us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicAndDilutedShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Earnings Per Share, Basic and Diluted (in dollars per share) |  |  |  |  |  |  |  |  | $ (0.40)us-gaap_EarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  | $ (1.83)us-gaap_EarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  | $ (3.26)us-gaap_EarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
HPU's |  |  |  |  |  |  |  |  |  |  |  |  |  |
Denominator for basic and diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average High Performance Units outstanding for basic and diluted earnings per share |  |  |  |  |  |  |  |  | 15star_WeightedAverageNumberOfHpuSharesOutstandingBasicAndDiluted / us-gaap_StatementClassOfStockAxis = star_HpuMember |  | 15star_WeightedAverageNumberOfHpuSharesOutstandingBasicAndDiluted / us-gaap_StatementClassOfStockAxis = star_HpuMember |  | 15star_WeightedAverageNumberOfHpuSharesOutstandingBasicAndDiluted / us-gaap_StatementClassOfStockAxis = star_HpuMember |
Basic and Diluted | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Numerator for basic and diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations attributable to iStar Financial Inc. and allocable to common shareholders |  |  |  |  |  |  |  |  | (33,722)star_IncomeLossFromContinuingOperationsAttributableToParentAndAvailableToCommonShareholders / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  | (177,907)star_IncomeLossFromContinuingOperationsAttributableToParentAndAvailableToCommonShareholders / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  | (282,452)star_IncomeLossFromContinuingOperationsAttributableToParentAndAvailableToCommonShareholders / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Income (loss) from discontinued operations |  |  |  |  |  |  |  |  | 0star_IncomeLossFromDiscontinuedOperations / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  | 623star_IncomeLossFromDiscontinuedOperations / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  | (16,908)star_IncomeLossFromDiscontinuedOperations / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Gain from discontinued operations |  |  |  |  |  |  |  |  | 0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  | 21,515us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  | 26,363us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Net income (loss) attributable to iStar Financial Inc. and allocable to common shareholders |  |  |  |  |  |  |  |  | (33,722)star_NetIncomeLossAttributabletoParentandAvailabletoCommonShareholders / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  | (155,769)star_NetIncomeLossAttributabletoParentandAvailabletoCommonShareholders / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  | (272,997)star_NetIncomeLossAttributabletoParentandAvailabletoCommonShareholders / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |
Denominator for basic and diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Number of Shares Outstanding, Basic and Diluted |  |  |  |  | 84,617us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 85,392us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 85,125us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | 84,824us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic and Diluted (in dollars per share) |  |  |  |  | (0.68)us-gaap_EarningsPerShareBasicAndDiluted / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | (0.36)us-gaap_EarningsPerShareBasicAndDiluted / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | (0.31)us-gaap_EarningsPerShareBasicAndDiluted / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember | (0.49)us-gaap_EarningsPerShareBasicAndDiluted / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Basic and Diluted | HPU's |  |  |  |  |  |  |  |  |  |  |  |  |  |
Numerator for basic and diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations attributable to iStar Financial Inc. and allocable to HPU holders |  |  |  |  |  |  |  |  | (1,129)star_IncomeLossFromContinuingOperationsAttributableToParentAndAvailableToHpuHolders / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember |  | (5,941)star_IncomeLossFromContinuingOperationsAttributableToParentAndAvailableToHpuHolders / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember |  | (9,574)star_IncomeLossFromContinuingOperationsAttributableToParentAndAvailableToHpuHolders / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember |
Income (loss) from discontinued operations |  |  |  |  |  |  |  |  | 0star_IncomeLossFromDiscontinuedOperations / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember |  | 21star_IncomeLossFromDiscontinuedOperations / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember |  | (573)star_IncomeLossFromDiscontinuedOperations / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember |
Gain from discontinued operations |  |  |  |  |  |  |  |  | 0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember |  | 718us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember |  | 894us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember |
Net income (loss) attributable to iStar Financial Inc. and allocable to HPU holders |  |  |  |  |  |  |  |  | $ (1,129)star_NetIncomeLossAttributabletoParentandAvailabletoHPUHolders / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember |  | $ (5,202)star_NetIncomeLossAttributabletoParentandAvailabletoHPUHolders / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember |  | $ (9,253)star_NetIncomeLossAttributabletoParentandAvailabletoHPUHolders / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember |
Denominator for basic and diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average High Performance Units outstanding for basic and diluted earnings per share | 15star_WeightedAverageNumberOfHpuSharesOutstandingBasicAndDiluted / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember | 15star_WeightedAverageNumberOfHpuSharesOutstandingBasicAndDiluted / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember | 15star_WeightedAverageNumberOfHpuSharesOutstandingBasicAndDiluted / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember | 15star_WeightedAverageNumberOfHpuSharesOutstandingBasicAndDiluted / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember | 15star_WeightedAverageNumberOfHpuSharesOutstandingBasicAndDiluted / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember | 15star_WeightedAverageNumberOfHpuSharesOutstandingBasicAndDiluted / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember | 15star_WeightedAverageNumberOfHpuSharesOutstandingBasicAndDiluted / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember | 15star_WeightedAverageNumberOfHpuSharesOutstandingBasicAndDiluted / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember |  |  |  |  |  |
Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) attributable to iStar Financial Inc. from continuing operations—Basic and diluted (in dollars per share) |  |  |  |  |  |  |  |  | $ (75.27)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember |  | $ (396.07)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember |  | $ (638.27)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember |
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic and Diluted Share |  |  |  |  |  |  |  |  | $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember |  | $ 1.40us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember |  | $ (38.20)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicAndDilutedShare / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Per Basic and Diluted Share |  |  |  |  |  |  |  |  | $ 0.00us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicAndDilutedShare / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember |  | $ 47.87us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicAndDilutedShare / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember |  | $ 59.60us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerBasicAndDilutedShare / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember |
Earnings Per Share, Basic and Diluted (in dollars per share) |  |  |  |  |  |  |  |  | $ (75.27)us-gaap_EarningsPerShareBasicAndDiluted / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember |  | $ (346.80)us-gaap_EarningsPerShareBasicAndDiluted / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember |  | $ (616.87)us-gaap_EarningsPerShareBasicAndDiluted / star_EarningsPerShareTypeAxis = star_BasicandDilutedMember / us-gaap_StatementClassOfStockAxis = star_HpuMember |
[1] | Income (loss) from continuing operations attributable to iStar Financial Inc. was $(73.5) million, $(221.5) million and $(313.2) million for the years ended December 31, 2014, 2013 and 2012, respectively. See Note 13 for details on the calculation of earnings per share.
[2] | HPU holders are current and former Company employees who purchased high performance common stock units under the Company's High Performance Unit Program.

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