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Earnings Per 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:        
Net income $ 9,535 $ 3,717 $ 15,745 $ 8,217
Less: Net income allocated to participating securities (83)   (120)  
Net income available to common shareholders $ 9,452 $ 3,717 $ 15,625 $ 8,217
Denominator:        
Weighted average common shares outstanding 20,338 20,059 20,319 20,021
Weighted average dilutive securities (in shares) 756 919 779 935
Weighted average common shares outstanding, diluted 21,094 20,978 21,098 20,956
Earnings per share        
Income per common share, basic (in dollars per share) $ 0.46 $ 0.19 $ 0.77 $ 0.41
Income per common share, diluted (in dollars per share) $ 0.45 $ 0.18 $ 0.74 $ 0.39
Nonvested performance shares
        
Earnings Per Share        
Anti-dilutive shares excluded from the diluted earnings per share calculation (in shares) 120 60 120 60
Employee stock options
        
Earnings Per Share        
Anti-dilutive shares excluded from the diluted earnings per share calculation (in shares) 358 90 112 90