Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net sales	$ 1,342,532	$ 1,175,270	$ 1,081,121
Cost of sales	733,547	666,579	610,890
Gross profit	608,985	508,691	470,231
Selling, general and administrative expenses	216,194	201,901	198,914
Engineering, research and development expenses	106,951	106,991	105,900
Amortization of intangible assets	44,023	44,263	47,349
Operating income	241,817	155,536	118,068
Interest expense	32,343	36,846	38,667
Interest income	(715)	(318)	(429)
Other expense (income), net	25,458	(991)	(12,355)
Income before income tax expense and equity in net loss of affiliate	184,731	119,999	92,185
Income tax expense	99,665	22,852	10,202
Equity in net loss of affiliate	0	0	1,687
Net income	$ 85,066	$ 97,147	$ 80,296
Earnings Per Share:
Basic net income (loss) per common share	$ 0.60	$ 0.69	$ 0.57
Diluted net income (loss) per common share	$ 0.59	$ 0.68	$ 0.57
Weighted shares outstanding
Basic	141,553	141,093	140,353
Diluted	143,518	142,050	141,121