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Summary of Significant Accounting Policies (Income Taxes) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Entity Information [Line Items]      
Operating loss carryforwards   $ 529,600  
Total income tax (expense) benefit $ 118 (89) $ (369)
Refund received 700 3,000  
Taxable REIT Subsidiaries      
Entity Information [Line Items]      
Operating loss carryforwards 40,300 38,400  
Assets owned taxable subsidiaries 681,800    
Current tax benefit (expense) 82 (106) (35)
Total income tax (expense) benefit 82 (106) (35)
Taxable loss 1,700    
Operating loss carryforwards   162,800  
Operating loss carryforwards subject to expiration   73,600  
Deferred tax assets 69,360 80,101  
Valuation allowance (69,360) (80,101)  
Net deferred tax assets (liabilities) 0 0  
Real estate asset basis differences 18,700 26,700  
Deferred expenses and other items 8,000 12,700  
Other credits 2,400 2,300  
REIT      
Entity Information [Line Items]      
Current tax benefit (expense) (100) (100) (400)
Income taxes paid $ 300 $ 800 $ 400