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Summary of Significant Accounting Policies (Income Taxes) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Entity Information [Line Items]      
Assets with foreclosure elections $ 749,200    
Operating loss carryforwards   $ 856,400  
Total income tax (expense) benefit (7,639) (3,912) $ 659
Taxable REIT Subsidiaries      
Entity Information [Line Items]      
Operating loss carryforwards 3,200 4,100  
Assets owned taxable subsidiaries 516,900    
Current tax (expense) benefit (7,639) (3,912) 659
Deferred tax (expense) benefit 0 0 0
Total income tax (expense) benefit (7,639) (3,912) 659
Income of subsidiaries 17,000 19,300 (1,800)
Income taxes paid 8,400 1,300 $ 9,200
Deferred tax assets 53,910 54,318  
Valuation allowance (53,910) (54,318)  
Net deferred tax assets (liabilities) 0 0  
Real estate asset basis differences 40,000 45,200  
Deferred expenses and other items $ 10,700 $ 5,000