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Consolidated Quarterly Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly financial data
Net Sales	$ 205,853	$ 204,802	$ 215,404	$ 185,740	$ 216,277	$ 202,643	$ 219,084	$ 183,979	$ 811,799	$ 821,983	$ 752,011
Gross Profit	87,289	88,657	95,033	78,081	93,084	87,163	95,263	76,917	349,060	352,427	325,908
Net Earnings (Loss)	$ 13,196	$ (951)	$ 14,817	$ 5,026	$ 17,541	$ 11,792	$ 15,523	$ 5,795	$ 32,088	$ 50,651	$ 40,231
Earnings Per Share, Basic	$ 0.74	$ (0.05)	$ 0.81	$ 0.27	$ 0.96	$ 0.65	$ 0.85	$ 0.32	$ 1.78	$ 2.78	$ 2.20
Earnings Per Share, Diluted	0.73	(0.05)	0.79	0.27	0.93	0.63	0.83	0.31	1.74	2.70	2.14
Cash Dividends Declared per Common Share	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.20	$ 0.18	$ 0.80	$ 0.78	$ 0.72

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Aggregate dividends declared during the period for each share of common stock outstanding.

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