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Summary of Significant Accounting Policies (Income Taxes) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Entity Information [Line Items] |  |  |
Assets with foreclosure elections | $ 139,700 |  |
Operating loss carryforwards |  | $ 948,800 |
Total income tax (expense) benefit | 948 | 10,166 | $ (7,639)
Provision adjustment | (2,800) |  |
Taxable REIT Subsidiaries |  |  |
Entity Information [Line Items] |  |  |
Operating loss carryforwards | 21,300 | 15,600 |
Assets owned taxable subsidiaries | 759,600 |  |
Current tax benefit (expense) | 531 | 9,751 | (7,639)
Total income tax (expense) benefit | 531 | 9,751 | (7,639)
REIT income tax benefit | 400 |  |
Income (loss) of subsidiaries | (33,100) | 49,400 | 17,000
Income taxes paid | 6,000 | 200 | $ 8,400
Deferred tax assets | 63,258 | 66,498 |
Valuation allowance | (63,258) | (66,498) |
Net deferred tax assets (liabilities) | 0 | 0 |
Real estate asset basis differences | 26,100 | 29,700 |
Other credits | 2,300 |  |
Deferred expenses and other items | $ 13,600 | $ 21,200 |

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