Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
REVENUES:
Revenues	$ 1,271,004	$ 1,266,208	$ 1,400,040
Cost of Goods Sold	809,507	794,344	830,012
Gross profit	461,497	471,864	570,028
OPERATING EXPENSES:
Selling, general and administrative	283,953	276,982	320,002
Research and development	42,948	48,611	52,867
Restructuring, strategic transaction and integration expenses	28,409	80,574	105,390
Change in fair value of contingent earn-out	9,000	(47,400)	20,400
Contractsettlements	(975)	5,737	41,613
Total operating expenses	363,335	364,504	540,272
Income from operations	98,162	107,360	29,756
Interest Expense	(1,753)	(549)	(709)
OTHER (EXPENSE) INCOME,NET	1,085	7,896	(6,673)
Income before income taxes	97,494	114,707	22,374
(PROVISION) BENEFIT FOR INCOME TAXES	(10,624)	(13,672)	6,419
Net Income	$ 86,870	$ 101,035	$ 28,793
Basic	$ 4.16	$ 4.90	$ 1.41
Diluted	$ 4.02	$ 4.69	$ 1.33
WEIGHTED AVERAGE NUMBER OF SHARES
Basic (in shares)	20,907	20,629	20,394
Diluted (in shares)	21,591	21,545	21,601