Consolidated Statements of Operations (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Income Statement [Abstract]
Net sales	$ 138,045	$ 135,837	$ 428,738	$ 369,322
Cost of sales	85,926	84,102	263,884	229,567
Gross profit	52,119	51,735	164,854	139,755
Selling, engineering and administrative expenses	24,066	25,440	75,531	69,078
Restructuring charges	1,724		1,724
Amortization of intangible assets	4,478	7,049	13,544	17,174
Loss on disposal of intangible asset	2,713		2,713
Operating income	19,138	19,246	71,342	53,503
Interest expense, net	3,790	4,622	12,223	9,256
Foreign currency transaction loss (gain), net	30	(42)	92	3,770
Miscellaneous (income) expense, net	(72)	141	(122)	185
Change in fair value of contingent consideration	(72)	275	703	928
Income before income taxes	15,462	14,250	58,446	39,364
Income tax provision	2,671	2,651	11,986	9,058
Net income	$ 12,791	$ 11,599	$ 46,460	$ 30,306
Basic and diluted net income per common share	$ 0.40	$ 0.36	$ 1.45	$ 0.97
Basic and diluted weighted average shares outstanding	32,027	31,843	32,006	31,093
Dividends declared per share	$ 0.09	$ 0.09	$ 0.27	$ 0.27