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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Stockholders' Equity [Abstract]      
Cash dividends paid, per share $ 0.41us-gaap_CommonStockDividendsPerShareCashPaid $ 0.37us-gaap_CommonStockDividendsPerShareCashPaid $ 0.35us-gaap_CommonStockDividendsPerShareCashPaid