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Summary of Significant Accounting Policies Tax (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income and other tax expense (benefit) | $ 478 | $ 1,613 | $ 917
Tax Treatment Of Dividends And Distributions Ordinary Dividends | $ 1.22126 | $ 0.722 | $ 1.591
Tax Treatment Of Dividends And Distributions Qualified Dividends |  |  | 0.037
Tax Treatment Of Dividends And Distributions Long Term Capital Gain | 0.18959 | 9.176 | 0.443
Tax Treatment Of Dividends And Distributions Unrecaptured Section Twelve Hundred And Fifty Gain | 0.10040 | 3.117 | 0.139
Distributions declared per Common Share outstanding | $ 1.51125 | $ 13.015 | $ 2.210
Income, Franchise, and Exise Taxes [Member] |  |  |
Income and other tax expense (benefit) | $ 478 | $ 1,613 | $ 917
Discontinued operations, net |  | 12 | 15
Provision for income, franchise and excise taxes | $ 478 | $ 1,625 | $ 932

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- Definition The cash outflow related to a type of depreciation-recapture income that is realized on the sale of depreciable real estate. Unrecaptured Section 1250 income is taxed at a 25% maximum capital gains rate (or in some cases less). + References No definition available. + Details
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