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Consolidated Condensed Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net sales	$ 190,117	$ 184,792	$ 573,837	$ 559,426
Cost of sales	87,570	83,583	266,753	258,055
Gross profit	102,547	101,209	307,084	301,371
Selling and administrative expense	80,807	79,009	259,396	251,681
Research and development expense	8,270	8,353	23,929	24,620
Operating expenses	89,077	87,362	283,325	276,301
Income from operations	13,470	13,847	23,759	25,070
Other expense	0	0	0	2,942
Interest expense	4,806	3,861	13,323	11,448
Income before income taxes	8,664	9,986	10,436	10,680
Provision for income taxes	1,467	2,649	1,645	2,724
Net income	7,197	7,337	8,791	7,956
Comprehensive income	$ 10,446	$ 7,901	$ 19,666	$ 10,033
Per share data:
Basic (in dollars per share)	$ 0.26	$ 0.26	$ 0.31	$ 0.29
Diluted (in dollars per share)	0.26	0.26	0.31	0.28
Dividends per share of common stock (in dollars per share)	$ 0.20	$ 0.20	$ 0.60	$ 0.60
Weighted average common shares:
Basic (shares)	27,924	27,818	27,915	27,785
Diluted (shares)	28,183	27,951	28,124	27,946

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