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Other Assets and Other Liabilities (Details 2) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Taxes [Line Items]      
Deferred tax assets(1) $ 50,968,000 [1] $ 40,800,000 [1]  
Valuation allowance (50,968,000) (40,800,000)  
Net deferred tax assets (liabilities) 0 0  
Operating loss carryforwards     423,900,000
Taxable REIT Subsidiaries (TRS)
      
Income Taxes [Line Items]      
Real estate asset basis differences 36,300,000 31,200,000  
Operating loss carryforwards 6,700,000 10,800,000  
Investment basis differences $ 7,900,000 $ (1,200,000)  
[1] Deferred tax assets as of March 31, 2013, include real estate basis differences of $36.3 million, net operating loss carryforwards of $6.7 million and investment basis differences of $7.9 million. 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.