CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Consolidated net income		$ 50,331	[1]	$ 44,521	[2]	$ 40,773	[3]
Other comprehensive income (loss):
Foreign currency translation adjustments, net of tax	[4]	(3,457)		6,922		3,267
Pension liability adjustments, net of tax	[5]	2,832		(1,050)		1,147
Total other comprehensive income (loss)		(625)		5,872		4,414
Total consolidated comprehensive income		$ 49,706		$ 50,393		$ 45,187

[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.

[4] The tax effect on this component of comprehensive income was nominal in 2021, 2020 and 2019.

[5] The tax effect on this component of comprehensive income was $920, ($202) and $267 in 2021, 2020 and 2019, respectively.