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Consolidated Statements Of Shareholders' Equity (Parenthetical) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash dividends declared, per share $ 1.92us-gaap_CommonStockDividendsPerShareDeclared $ 1.68us-gaap_CommonStockDividendsPerShareDeclared $ 1.48us-gaap_CommonStockDividendsPerShareDeclared