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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Numerator [Abstract]      
Net income $ 45,172 $ 44,862 $ 38,827
Basic earnings per share [Abstract]      
Weighted average shares (in shares) 15,598,000 15,466,000 15,313,000
Diluted earnings per share [Abstract]      
Dilutive effect of equity grants (in shares) 75,000 55,000 51,000
Adjusted weighted average shares (in shares) 15,673,000 15,521,000 15,364,000
Earnings per share [Abstract]      
Basic earnings per share (in dollars per share) $ 2.90 $ 2.90 $ 2.54
Diluted earnings per share (in dollars per share) $ 2.88 $ 2.89 $ 2.53
Options [Member]
      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Options excluded from diluted calculations (in shares) 59,563 89,746 323,255
Weighted average price of outstanding options (in dollars per share) $ 38.95 $ 38.95 $ 33.02