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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) (Parenthetical) (USD $)
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Common stock, par value beginning balance $ 0.001 $ 0.001
Common stock, par value ending balance $ 0.001 $ 0.001
Options exercised, shares 386,616 766,716
Conversion of common stock units, shares 10,834 11,851
Conversion of restricted stock units, shares 168,049 146,407
Cash dividends, per share $ 0.69 $ 0.585
Treasury stock, beginning balance, shares 23,117,554 22,943,925
Treasury stock, acquisition of shares 190,876 173,629
Treasury stock, ending balance, shares 23,308,430 23,117,554