CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Income Statement [Abstract]
Revenue	$ 706,793		$ 590,623		$ 626,099
Cost of revenue	406,465		346,106		364,014
Gross profit	300,328		244,517		262,085
Operating expenses:
Research and development and engineering	72,522		60,996		55,965
Selling, general and administrative	129,155		109,853		118,407
Amortization of purchased intangible assets	16,577		13,970		15,857
Restructuring, acquisition and related costs	18,020		3,810		16,574
Total operating expenses	236,274		188,629		206,803
Operating income	64,054		55,888		55,282
Interest income (expense), net	(7,387)		(6,564)		(8,493)
Foreign exchange transaction gains (losses), net	(127)		(942)		(780)
Other income (expense), net	(368)		21		(243)
Income before income taxes	56,172		48,403		45,766
Income tax provision	5,841		3,882		4,993
Consolidated net income	$ 50,331	[1]	$ 44,521	[2]	$ 40,773	[3]
Earnings per common share (Note 9):
Basic	$ 1.42	[1]	$ 1.27	[2]	$ 1.16	[3]
Diluted	$ 1.41	[1]	$ 1.25	[2]	$ 1.15	[3]
Weighted average common shares outstanding—basic	35,396	[1]	35,144	[2]	35,030	[3]
Weighted average common shares outstanding—diluted	35,781	[1]	35,654	[2]	35,546	[3]

[1] For the year ended December 31, 2021, 45 shares of non-GAAP EPS performance-based restricted stock units and 37 shares of operating cash flow performance-based restricted stock units granted to certain members of the executive management team and 213 shares of restricted stock issued to Laser Quantum former non-controlling interest shareholders are considered contingently issuable shares and were excluded from the calculation of the denominator as the contingent conditions had not been met as of December 31, 2021.

[2] For the year ended December 31, 2020, 45 shares of non-GAAP EPS performance-based restricted stock units granted to certain members of the executive management team and 213 shares of restricted stock issued to Laser Quantum former non-controlling interest shareholders were considered contingently issuable shares and were excluded from the calculation of the denominator as the contingent conditions had not been met as of December 31, 2020.

[3] For the year ended December 31, 2019, 46 shares of non-GAAP EPS performance-based restricted stock units granted to certain members of the executive management team and 213 shares of restricted stock issued to Laser Quantum former non-controlling interest shareholders were considered contingently issuable shares and were excluded from the calculation of the denominator as the contingent conditions had not been met as of December 31, 2019.