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Summary of Significant Accounting Policies (Income Taxes) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Entity Information [Line Items]      
Assets with foreclosure elections $ 139,700    
Operating loss carryforwards   $ 948,800  
Total income tax (expense) benefit 948 10,166 $ (7,639)
Provision adjustment (2,800)    
Taxable REIT Subsidiaries      
Entity Information [Line Items]      
Operating loss carryforwards 21,300 15,600  
Assets owned taxable subsidiaries 759,600    
Current tax benefit (expense) 531 9,751 (7,639)
Total income tax (expense) benefit 531 9,751 (7,639)
REIT income tax benefit 400    
Income (loss) of subsidiaries (33,100) 49,400 17,000
Income taxes paid 6,000 200 $ 8,400
Deferred tax assets 63,258 66,498  
Valuation allowance (63,258) (66,498)  
Net deferred tax assets (liabilities) 0 0  
Real estate asset basis differences 26,100 29,700  
Other credits 2,300    
Deferred expenses and other items $ 13,600 $ 21,200