Condensed Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Net Sales	$ 448,405	$ 378,874	$ 860,732	$ 769,921
Cost of sales	241,033	212,600	467,882	426,254
Gross profit	207,372	166,274	392,850	343,667
Selling, general and administrative expenses	66,872	64,150	125,763	146,404
Engineering, research and development expenses	32,572	30,624	62,204	59,615
Amortization of intangible assets	13,216	16,591	29,427	35,248
Operating income	94,712	54,909	175,456	102,400
Interest expense	13,005	11,315	23,564	22,199
Interest income	(213)	(1,623)	(534)	(2,848)
Other (income) expense, net	(477)	(122,015)	401	(122,263)
Income before income tax expense	82,397	167,232	152,025	205,312
Income tax expense	14,361	43,235	22,983	48,657
Net income	$ 68,036	$ 123,997	$ 129,042	$ 156,655
Basic earnings per common share	$ 0.51	$ 0.92	$ 0.96	$ 1.16
Diluted earnings per common share	$ 0.50	$ 0.91	$ 0.95	$ 1.15
Weighted shares outstanding:
Basic	134,700	135,378	134,722	135,338
Diluted	136,007	136,581	136,188	136,637