Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net sales	$ 1,859,313	$ 1,591,066	$ 1,550,497
Cost of sales	1,009,591	879,413	830,666
Gross profit	849,722	711,653	719,831
Selling, general and administrative expenses	265,128	284,807	246,534
Engineering, research and development expenses	136,057	121,140	118,456
Amortization	53,092	66,428	62,152
Operating income	395,445	239,278	292,689
Interest expense	48,600	46,962	34,094
Interest income	(786)	(4,652)	(3,839)
Other (income) expense, net	(6,656)	(121,081)	8,002
Income before income tax expense	354,287	318,049	254,432
Income tax expense	59,318	63,189	13,677
Net income	$ 294,969	$ 254,860	$ 240,755
Earnings Per Share:
Basic net income per common share	$ 2.19	$ 1.89	$ 1.71
Diluted net income per common share	$ 2.16	$ 1.87	$ 1.69
Weighted average shares outstanding
Basic	134,837	135,137	141,026
Diluted	136,266	136,568	142,610