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Earnings Per Share (Calculation of Basic and Diluted EPS) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Net income	$ 12,316	$ 10,562	$ 24,483	$ 19,221
Average Common Shares:
Basic (weighted-average outstanding shares)	11,547	11,422	11,509	11,405
Dilutive potential common shares from stock options, shares	124	128	137	124
Diluted (weighted-average outstanding shares)	11,671	11,550	11,646	11,529
Basic earnings per share (in dollars per share)	$ 1.07	$ 0.93	$ 2.13	$ 1.69
Diluted earnings per share (in dollars per share)	$ 1.05	$ 0.92	$ 2.10	$ 1.67

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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