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Summary of Significant Accounting Policies (Income Taxes) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Entity Information [Line Items]      
Operating loss carryforwards   $ 614,600  
Total income tax (expense) benefit $ (567) 118 $ (89)
Refund received   700 3,000
Taxable REIT Subsidiaries      
Entity Information [Line Items]      
Operating loss carryforwards 40,800 40,300  
Assets owned taxable subsidiaries 430,100    
Current tax benefit (expense)   82 (106)
Total income tax (expense) benefit   82 (106)
Taxable loss 7,100    
Operating loss carryforwards   165,400  
Operating loss carryforwards subject to expiration   73,600  
Deferred tax assets 64,900 69,360  
Valuation allowance (64,900) (69,360)  
Net deferred tax assets (liabilities) 0 0  
Real estate asset basis differences 16,100 18,700  
Deferred expenses and other items 5,700 8,000  
Other credits 2,300 2,400  
REIT      
Entity Information [Line Items]      
Current tax benefit (expense) (13,500) (100) (100)
Income taxes paid $ 14,600 $ 300 $ 800