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Income Taxes (Taxability of Cash Distributions Paid on Common Shares) (Details) - Parent Company [Member] - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Investments, Owned, Federal Income Tax Note |  |  |
Ordinary income (dollars per share) | $ 2.79 | $ 3.28 | $ 3.07
Ordinary income (percentage per share) | 80.20% | 100.00% | 99.70%
Return of capital (dollars per share) | $ 0.31 | $ 0.00 | $ 0.00
Return of capital (percentage per share) | 8.90% | 0.00% | 0.00%
Un-recaptured Section 1250 gain dividends per share | $ 0.38 | $ 0.00 | $ 0.01
Un-recaptured Section 1250 gain dividends per share percentage | 10.90% | 0.00% | 0.30%
Total (dollars per share) | $ 3.48 | $ 3.28 | $ 3.08
Total (percentage per share) | 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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