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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
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 257,527 145,618
Conversion of common stock units, shares 11,851 4,266
Conversion of restricted stock units, shares 119,472 48,167
Cash dividends, per share $ 0.195 $ 0.13
Treasury stock, beginning balance, shares 22,943,925 22,028,030
Treasury stock, acquisition of shares 89,649 200,120
Treasury stock, ending balance, shares 23,033,574 22,228,150