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Earnings Per Common Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Numerator and denominator of the basic and diluted earnings per common share computations        
Numerator for both basic and diluted earnings per common share, net income $ 13,866 $ 11,033 $ 26,240 $ 20,221
Denominator for basic earnings per common share, weighted average common shares outstanding 27,493 27,454 27,486 27,453
Weighted average common stock equivalents 84 43 72 37
Denominator for diluted earnings per common share 27,577 27,497 27,558 27,490
Basic earnings per common share $ 0.50 $ 0.40 $ 0.95 $ 0.74
Diluted earnings per common share $ 0.50 $ 0.40 $ 0.95 $ 0.74
Earnings Per Common Share (Textual) [Abstract]        
Average number of exercisable employee stock option awards that were not included in the computation of diluted earnings per common share 637,661 682,462 622,252 659,875