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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

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