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Summary of Significant Accounting Policies (Details 2) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Accounting Policies [Abstract] |  |  |  |  |  |
Assets with foreclosure elections carrying value | $ 1,230,000,000 |  |  |  |  |
Income Tax Expense [Abstract] |  |  |  |  |  |
Deferred tax expense (benefit)(1) | 0 |  | (13,729,000) |  | 4,473,000 |
Total income tax expense (benefit) | 8,445,000 |  | (4,719,000) |  | 7,023,000 |
Components of Deferred Tax Assets and Liabilities [Abstract] |  |  |  |  |  |
Operating loss carryforwards |  |  | 423,900,000 |  |  |
Taxable REIT Subsidiaries (TRSs) |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Assets owned by taxable REIT subsidiaries | 796,800,000 |  |  |  |  |
Income Tax Expense [Abstract] |  |  |  |  |  |
Current tax expense | 8,445,000 |  | 9,010,000 |  | 2,550,000 |
Deferred tax expense (benefit)(1) | 0 | [1] | (13,729,000) | [1] | 4,473,000 | [1]
Total income tax expense (benefit) | 8,445,000 |  | (4,719,000) |  | 7,023,000 |
Income from TRS entities which are subject to tax | 42,200,000 |  | 75,800,000 |  |  |
Total cash paid for taxes | 5,500,000 |  | 8,500,000 |  | 7,300,000 |
Components of Deferred Tax Assets and Liabilities [Abstract] |  |  |  |  |  |
Operating loss carryforwards | 10,800,000 |  | 22,800,000 |  |  |
Deferred tax assets(1) | 40,800,000 | [2] | 50,889,000 | [2] |  |
Valuation allowance | (40,800,000) |  | (50,889,000) |  |  |
Net deferred tax assets (liabilities) | 0 |  | 0 |  |  |
Real estate asset basis differences | 31,200,000 |  | 30,800,000 |  |  |
Investment basis differences | $ (1,200,000) |  | $ (600,000) |  |  |
[1] | During the year ended December 31, 2011, the Company sold its investment in Oak Hill Advisors L.P. (see Note 6) and recognized a deferred tax benefit resulting from the reversal of a deferred tax liability associated with the investment. See the table below for the Company's deferred tax assets and liabilities as of December 31, 2012 and 2011.
[2] | Deferred tax assets as of December 31, 2012, include real estate basis differences of $31.2 million, net operating loss carryforwards of $10.8 million and investment basis differences of $(1.2) million. Deferred tax assets as of December 31, 2011, include real estate basis differences of $30.8 million, net operating loss carryforwards of $22.8 million and investment basis differences of $(0.6) million.

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