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Income Taxes Income Taxes (Schedule of Dividends Paid, Per Share) (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Common Stock, Dividends, Per Share, Cash Paid | $ 3.80 | $ 3.60 | $ 3.40
Ordinary Income [Member] |  |  |
Common Stock, Dividends, Per Share, Cash Paid | 2.93054 | 2.678634 | 2.62808
Capital Gain [Member] |  |  |
Common Stock, Dividends, Per Share, Cash Paid | 0.20643 | 0.921366 | 0.69110
Return of Capital [Member] |  |  |
Common Stock, Dividends, Per Share, Cash Paid | $ 0.66303 | $ 0 | $ 0.08082

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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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