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Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Numerator:
Net Earnings	$ 5,059	$ 5,324
Denominator:
Basic - Average Shares Outstanding (in shares)	18,343,933	18,722,156
Effect of dilutive securities - share-based compensation plans	545,384	506,116
Diluted - Weighted Average Shares Outstanding (in shares)	18,889,317	19,228,272
Basic Earnings per Share (in dollars per share)	$ 0.28	$ 0.28
Diluted Earnings per Share (in dollars per share)	$ 0.27	$ 0.28
Anti-dilutive securities excluded from earnings per share calculation (in shares)	212,968	177,414

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