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Summary of Significant Accounting Policies (Income Taxes) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Entity Information [Line Items]      
Assets with foreclosure elections $ 39,600    
Operating loss carryforwards   $ 567,700  
Total income tax (expense) benefit (438) (815) $ 948
Taxable REIT Subsidiaries      
Entity Information [Line Items]      
Operating loss carryforwards 32,500 25,600  
Assets owned taxable subsidiaries 752,000    
Current tax benefit (expense) (35) (447) 531
Total income tax (expense) benefit (35) (447) 531
Income (loss) of subsidiaries 31,600 25,900 33,100
Deferred tax assets 79,645 78,107  
Valuation allowance (79,645) (78,107)  
Net deferred tax assets (liabilities) 0 0  
Real estate asset basis differences 32,900 35,300  
Deferred expenses and other items 11,900 17,200  
Other credits 2,300    
REIT      
Entity Information [Line Items]      
Current tax benefit (expense) (400) (500) 400
Income taxes paid $ 400 $ 2,000 $ 6,000