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Background and Basis of Presentation (Narrative) (Details) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Dividends Payable [Line Items] |  |  |  |  |
Quarterly dividends declared (usd per share) | $ 0.52 | $ 0.48 | $ 1.48 | $ 1.36 | $ 1.84
Current annualized dividend rate |  |  | $ 2.08 |  |
Dividend Declared [Member] | Common Stock [Member] |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |
Increase in rate of dividend | 8.30% |  |  |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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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