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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Numerator:
Net Earnings	$ 15,370	$ 11,477	$ 15,328	$ 4,439	$ 13,196	$ (951)	$ 14,817	$ 5,026	$ 46,614	$ 32,088	$ 50,651
Basic - Weighted Average Shares Outstanding									17,523,267	18,015,151	18,217,384
Effect of dilutive securities									452,916	478,296	523,474
Diluted - Weighted Average Shares Outstanding									17,976,183	18,493,447	18,740,858
Basic Earnings per Share	$ 0.88	$ 0.66	$ 0.88	$ 0.25	$ 0.74	$ (0.05)	$ 0.81	$ 0.27	$ 2.66	$ 1.78	$ 2.78
Diluted Earnings per Share	$ 0.85	$ 0.64	$ 0.85	$ 0.25	$ 0.73	$ (0.05)	$ 0.79	$ 0.27	$ 2.59	$ 1.74	$ 2.70
Anti-dilutive securities excluded from earnings per share calculation (in shares)									356,598	222,092	91,199

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