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Dividends (Quarterly Dividend Payments) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Dividends [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends per common share (in dollars per share) | $ 0.175 us-gaap_CommonStockDividendsPerShareCashPaid | [1] | $ 0.17375 us-gaap_CommonStockDividendsPerShareCashPaid | [1] | $ 0.17250 us-gaap_CommonStockDividendsPerShareCashPaid | [1] | $ 0.17125 us-gaap_CommonStockDividendsPerShareCashPaid | [1] | $ 0.17 us-gaap_CommonStockDividendsPerShareCashPaid | [1] | $ 0.16875 us-gaap_CommonStockDividendsPerShareCashPaid | [1] | $ 0.1675 us-gaap_CommonStockDividendsPerShareCashPaid | [1] | $ 0.16625 us-gaap_CommonStockDividendsPerShareCashPaid | [1] |  |  |
Total cash dividends paid | $ 12,479 us-gaap_PaymentsOfDividendsCommonStock |  | $ 12,335 us-gaap_PaymentsOfDividendsCommonStock |  | $ 12,186 us-gaap_PaymentsOfDividendsCommonStock |  | $ 12,077 us-gaap_PaymentsOfDividendsCommonStock |  |  |  |  |  |  |  |  |  | $ 49,077 us-gaap_PaymentsOfDividendsCommonStock | $ 46,707 us-gaap_PaymentsOfDividendsCommonStock | $ 44,093 us-gaap_PaymentsOfDividendsCommonStock
Record date | Nov. 21, 2014 |  | Aug. 22, 2014 |  | May 23, 2014 |  | Feb. 21, 2014 |  |  |  |  |  |  |  |  |  |  |  |
Payment date | Dec. 26, 2014 |  | Sep. 26, 2014 |  | Jun. 27, 2014 |  | Mar. 28, 2014 |  |  |  |  |  |  |  |  |  |  |  |
[1] | Year-to-date earnings and cash dividends per common share amounts may differ from the sum of quarterly amounts due to rounding.

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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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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Details
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- Definition Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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