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Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Numerator [Abstract]
Net income	$ 44,862	$ 38,827	$ 33,034
Basic earnings per share [Abstract]
Weighted average shares (in shares)	15,466,274	15,313,081	15,233,858
Diluted earnings per share [Abstract]
Dilutive effect of equity grants	54,243	51,112	24,936
Adjusted weighted average shares (in shares)	15,520,517	15,364,193	15,258,794
Earnings per share [Abstract]
Basic earnings per share (in dollars per share)	$ 2.90	$ 2.54	$ 2.17
Diluted earnings per share (in dollars per share)	$ 2.89	$ 2.53	$ 2.16
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options excluded from diluted calculations (in shares)	89,746	323,255	422,972
Weighted average price of outstanding options (in dollars per share)	$ 38.95	$ 33.02	$ 32.36

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