Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net income	$ 72,140	$ 61,290	$ 65,699
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments gains (losses)	589	(1,857)	84
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax	291	(199)	0
Defined benefit pension plans:
Net gain (loss) arising during the year	(77)	553	141
Amortization of defined benefit pension items:
Net actuarial loss	0	71	102
Prior service cost	0	17	47
Amortization of defined benefit pension items:	0	88	149
Defined benefit pension plan adjustments	(77)	641	290
Total other comprehensive income (loss), net of tax	803	(1,415)	374
Comprehensive income	$ 72,943	$ 59,875	$ 66,073