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Dividends (Dividends Paid) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Dividends [Abstract] |  |  |  |  |  |
Cash dividend per common share | $ 0.16875 | $ 0.16750 | $ 0.16625 |  |  |
Total cash dividends paid | $ 11,829 | $ 11,516 | $ 11,415 |  | $ 34,760 | $ 32,866
Record date | Aug. 16, 2013 | May 10, 2013 | Feb. 22, 2013 |  |  |
Payment date | Sep. 20, 2013 | Jun. 14, 2013 | Mar. 15, 2013 |  |  |
Cash dividend per common share based on weighted average number of shares | $ 0.17 |  |  | $ 0.16 | $ 0.50 | $ 0.49

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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 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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