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Consolidated Statements of Stockholders' Equity (Parenthetical) (Retained Earnings [Member], USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Retained Earnings [Member]
     
Cash dividends, per common share $ 1.64us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 0.91us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 0.49us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember