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Summary of Significant Accounting Policies (Income Taxes) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Entity Information [Line Items] |  |  |
Assets with foreclosure elections | $ 113,100 |  |
Operating loss carryforwards |  | $ 582,400 |
Total income tax (expense) benefit | (815) | 948 | $ 10,166
Provision adjustment |  |  | 2,800
Taxable REIT Subsidiaries |  |  |
Entity Information [Line Items] |  |  |
Operating loss carryforwards | 25,600 | 21,300 |
Assets owned taxable subsidiaries | 538,000 |  |
Current tax benefit (expense) | (447) | 531 | 9,751
Total income tax (expense) benefit | (447) | 531 | 9,751
Income (loss) of subsidiaries | 25,900 | 33,100 | 49,400
Deferred tax assets | 78,107 | 63,258 |
Valuation allowance | (78,107) | (63,258) |
Net deferred tax assets (liabilities) | 0 | 0 |
Real estate asset basis differences | 35,300 | 26,100 |
Other credits | 2,300 |  |
Deferred expenses and other items | 14,900 | 15,900 |
REIT |  |  |
Entity Information [Line Items] |  |  |
Current tax benefit (expense) | (500) | 400 |
Income taxes paid | $ 2,000 | $ 6,000 | $ 200

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