Quarterly report pursuant to Section 13 or 15(d)

Net Income Per Share (Details)

v2.4.0.8
Net Income Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Numerator [Abstract]        
Numerator for basic and diluted income per share - net income $ 17,178 $ 13,831 $ 27,379 $ 24,685
Denominator [Abstract]        
Denominator for basic income per share - weighted-average shares 30,925 30,161 30,834 29,838
Denominator for diluted income per share - adjusted weighted-average shares 31,408 30,736 31,364 30,477
Basic income per share (dollars per share) $ 0.56 $ 0.46 $ 0.89 $ 0.83
Diluted income per share (dollars per share) $ 0.55 $ 0.45 $ 0.87 $ 0.81
Total number anti-dilutive options, non-vested shares, and performance shares excluded from income per diluted share computation     201 176
Stock Option [Member]
        
Denominator [Abstract]        
Effect of dilutive stock options and non-vested shares 411 476 438 537
Total number anti-dilutive options, non-vested shares, and performance shares excluded from income per diluted share computation     182 176
Key Employee Performance Share Based Plan [Member]
        
Denominator [Abstract]        
Effect of dilutive stock options and non-vested shares 31 9 43 6
Total number anti-dilutive options, non-vested shares, and performance shares excluded from income per diluted share computation     19 0
Nonvested Shares [Member]
        
Denominator [Abstract]        
Effect of dilutive stock options and non-vested shares 41 90 49 96