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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Numerator [Abstract]        
Net income $ 11,942 $ 12,232 $ 23,762 $ 24,101
Basic earnings per share [Abstract]        
Weighted average shares (in shares) 15,565,000 15,451,000 15,552,000 15,429,000
Diluted earnings per share [Abstract]        
Effect of dilutive stock options (in shares) 76,000 50,000 73,000 46,000
Adjusted weighted average shares (in shares) 15,641,000 15,501,000 15,625,000 15,475,000
Earnings per share [Abstract]        
Basic earnings per share (in dollars per share) $ 0.77 $ 0.79 $ 1.53 $ 1.56
Diluted earnings per share (in dollars per share) $ 0.76 $ 0.79 $ 1.52 $ 1.56
Options [Member]
        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Options excluded from diluted calculations (in shares) 88,246 89,746 88,246 178,569
Weighted average price for anti dilutive securities (in dollars per share) $ 38.95   $ 38.95