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Distributions - Tax Characteristics of Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Distributions [Abstract] |  |  |
Common Share Distributions Payments of Ordinary Dividends | $ 0 | $ 0.36 | $ 0.41
Common Share Distributions Capital Gain | 0.62 | 0.14 | 0.02
Common Share Distributions Non-taxable Distributions | 0 | 0.10 | 0.17
Common Stock, Dividends, Per Share, Paid | $ 0.62 | $ 0.60 | $ 0.60
Percentage Of Distributions classified as ordinary income | 0.00% | 59.10% | 69.00%
Percentage Of Distributions classified as capital gain | 100.00% | 23.50% | 3.30%
Percentage Of Distributions classified as non-taxable distribution | 0.00% | 17.40% | 27.70%
Dividends, Preferred Stock | $ 6,900 | $ 6,900 | $ 6,900
Percentage Of Preferred Distributions classified as ordinary income | 100.00% | 100.00% | 100.00%

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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