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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) (Parenthetical) (USD $)
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Consolidated Statements of Changes in Shareholders' Equity [Abstract]    
Common stock, par value beginning balance $ 0.001 $ 0.001
Common stock, par value ending balance $ 0.001 $ 0.001
Options exercised, shares 382,956 563,487
Conversion of common stock units, shares 10,834 11,851
Conversion of restricted stock units, shares 91,353 141,732
Cash dividends, per share $ 0.46 $ 0.39
Treasury stock, beginning balance, shares 23,117,554 22,943,925
Treasury stock, acquisition of shares 136,976 173,428
Treasury stock, ending balance, shares 23,254,530 23,117,353