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Earnings Per Share (Calculation of Basic and Diluted EPS) (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
Earnings Per Share [Abstract]
Net Income	$ 9,344	$ 8,914	$ 16,129	$ 14,581
Basic (weighted-average outstanding shares)	11,884	11,845	11,879	11,839
Dilutive potential common shares from stock options	174	121	163	134
Diluted (weighted-average outstanding shares)	12,058	11,966	12,042	11,973
Basic earnings per share	$ 0.79	$ 0.75	$ 1.36	$ 1.23
Diluted earnings per share	$ 0.77	$ 0.74	$ 1.34	$ 1.22

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