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Summary of Significant Accounting Policies (Income Taxes) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Entity Information [Line Items] |  |  |  |
Assets with foreclosure elections | $ 31,500 |  |  |
Operating loss carryforwards |  | $ 460,600 |  |
Total income tax (expense) benefit | (235) | (438) | $ (815) |
Refund received |  |  |  | $ 3,000
Taxable REIT Subsidiaries |  |  |  |
Entity Information [Line Items] |  |  |  |
Operating loss carryforwards | 38,400 | 32,500 |  |
Assets owned taxable subsidiaries | 562,300 |  |  |
Current tax benefit (expense) | (106) | (35) | (447) |
Total income tax (expense) benefit | (106) | (35) | (447) |
Taxable loss | 28,700 |  |  |
Operating loss carryforwards |  | 123,400 |  |
Operating loss carryforwards subject to expiration |  | 73,600 |  |
Deferred tax assets | 80,101 | 79,645 |  |
Valuation allowance | (80,101) | (79,645) |  |
Net deferred tax assets (liabilities) | 0 | 0 |  |
Real estate asset basis differences | 26,700 | 32,900 |  |
Deferred expenses and other items | 12,700 | 11,900 |  |
Other credits | 2,300 | 2,300 |  |
REIT |  |  |  |
Entity Information [Line Items] |  |  |  |
Current tax benefit (expense) | (100) | (400) | (500) |
Income taxes paid | $ 800 | $ 400 | $ 2,000 |

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