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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Numerator:
Net Earnings	$ 14,817	$ 15,523	$ 19,843	$ 21,318
Denominator:
Basic - Weighted Average Shares Outstanding	18,197,431	18,167,054	18,240,027	18,242,240
Effect of dilutive securities:
Share-based compensation plans	474,609	508,553	484,832	534,129
Diluted - Weighted Average Shares Outstanding	18,672,040	18,675,607	18,724,859	18,776,369
Basic Earnings per Share	$ 0.81	$ 0.85	$ 1.09	$ 1.17
Diluted Earnings per Share	$ 0.79	$ 0.83	$ 1.06	$ 1.14
Anti-dilutive securities excluded from earnings per share calculation	237,405	154,897	215,767	155,497

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