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Income Taxes Reconciliation of Income Tax Attributable to Continuing Operations (Details) - Subsidiary of Common Parent - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Investments, Owned, Federal Income Tax Note |  |  |
Tax expense/(benefit) at U.S. statutory rates on TRS income subject to tax | $ 2,177 | $ 3,185 | $ 2,506
Effect of Permanent Differences and Other | 0 | 0 | (730)
Valuation Allowance Change in Amount | (2,177) | (3,185) | (1,776)
Income tax expense/(benefit) | $ 0 | $ 0 | $ 0

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