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Income Taxes Income Taxes (Schedule of Dividends Paid, Per Share) (Details) - $ / shares	12 Months Ended
	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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