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Summary of Significant Accounting Policies (Details 2) (USD $)
 12 Months Ended
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.