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Summary of Significant Accounting Policies (Income Taxes) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Entity Information [Line Items]      
Assets with foreclosure elections $ 578,100    
Operating loss carryforwards   $ 902,900  
Total income tax (expense) benefit 10,166 (7,639) $ (3,912)
Provision adjustment 2,800    
Taxable REIT Subsidiaries      
Entity Information [Line Items]      
Operating loss carryforwards 15,600 3,200  
Assets owned taxable subsidiaries 603,900    
Current tax benefit (expense) 9,751 (7,639) (3,912)
Deferred tax benefit (expense) 0 0 0
Total income tax (expense) benefit 9,751 (7,639) (3,912)
REIT income tax benefit 400    
Income (loss) of subsidiaries (49,400) 17,000 19,300
Income taxes paid 200 8,400 $ 1,300
Deferred tax assets 66,498 53,910  
Valuation allowance (66,498) (53,910)  
Net deferred tax assets (liabilities) 0 0  
Real estate asset basis differences 29,700 40,000  
Other credits 3,300    
Deferred expenses and other items $ 17,900 $ 10,700