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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

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