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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Numerator [Abstract]        
Net income $ 12,653 $ 10,209 $ 36,415 $ 34,310
Basic earnings per share [Abstract]        
Weighted average shares (in shares) 15,594,000 15,491,000 15,566,000 15,450,000
Diluted earnings per share [Abstract]        
Effect of dilutive stock options (in shares) 94,000 64,000 81,000 51,000
Adjusted weighted average shares (in shares) 15,688,000 15,555,000 15,647,000 15,501,000
Earnings per share [Abstract]        
Basic earnings per share (in dollars per share) $ 0.81 $ 0.66 $ 2.34 $ 2.22
Diluted earnings per share (in dollars per share) $ 0.81 $ 0.66 $ 2.33 $ 2.21
Options [Member]
        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Options excluded from diluted calculations (in shares) 0 89,746 82,792 89,746
Weighted average price for anti dilutive securities (in dollars per share)     $ 38.95