Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Net sales	$ 763,520	$ 719,168	$ 740,055
Cost of sales	355,190	337,466	335,998
Gross profit	408,330	381,702	404,057
Selling and administrative expense	338,400	303,091	323,492
Research and development expense	32,254	27,436	27,779
Total operating expenses	370,654	330,527	351,271
Income from operations	37,676	51,175	52,786
Other expense	2,942	0	0
Interest expense	15,359	6,031	6,111
Income before income taxes	19,375	45,144	46,675
Provision for income taxes	4,711	14,646	14,483
Net income	$ 14,664	$ 30,498	$ 32,192
Earnings per share:
Basic (in dollars per share)	$ 0.53	$ 1.10	$ 1.17
Diluted (in dollars per share)	0.52	1.09	1.16
Dividends per share of common stock (in dollars per share)	$ 0.80	$ 0.80	$ 0.80
Other comprehensive income (loss), before tax:
Foreign currency translation adjustments	$ (4,501)	$ (16,775)	$ (15,069)
Pension liability	(755)	7,578	(18,781)
Cash flow hedging gain (loss)	547	(3,291)	7,393
Other comprehensive income, before tax	9,955	18,010	5,735
Provision (benefit) for income taxes related to items of other comprehensive income	(77)	1,584	(4,207)
Comprehensive income	$ 10,032	$ 16,426	$ 9,942