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Consolidated Condensed Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net sales	$ 202,064	$ 186,567
Cost of sales	92,507	86,682
Gross profit	109,557	99,885
Selling and administrative expense	84,568	94,761
Research and development expense	7,711	7,618
Operating expenses	92,279	102,379
Income (loss) from operations	17,278	(2,494)
Interest expense	4,818	4,119
Income (loss) before income taxes	12,460	(6,613)
Provision (benefit) for income taxes	1,803	(2,068)
Net income (loss)	10,657	(4,545)
Comprehensive income (loss)	$ 13,402	$ (924)
Per share data:
Basic (in dollars per share)	$ 0.38	$ (0.16)
Diluted (in dollars per share)	0.37	(0.16)
Dividends per share of common stock (in dollars per share)	$ 0.20	$ 0.20
Weighted average common shares:
Basic (shares)	28,008	27,867
Diluted (shares)	28,573	27,867

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