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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (Retained Earnings, USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Retained Earnings |  |  |
Dividends to Stockholders, per common share | $ 0.620 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 0.550 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 0.470 us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember

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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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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration