Supplemental Balance Sheet and Income Statement Information - Accumulated other comprehensive income (loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Changes in accumulated other comprehensive income (loss)
Beginning balance	$ 134,996
Other comprehensive income (loss), net of tax	(116)	$ (93)
Ending balance	342,660
Accumulated Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive income (loss)
Beginning balance	(10,414)	(10,832)
Other comprehensive income (loss) before reclassifications	(157)	(134)
Amounts reclassified from accumulated other comprehensive income (loss)	41	41
Other comprehensive income (loss), net of tax	(116)	(93)
Ending balance	(10,530)	(10,925)
Gains (losses) on cash flow hedges
Changes in accumulated other comprehensive income (loss)
Beginning balance	2	2
Ending balance	2	2
Defined benefit pension plan items
Changes in accumulated other comprehensive income (loss)
Beginning balance	(3,444)	(3,606)
Amounts reclassified from accumulated other comprehensive income (loss)	41	41
Other comprehensive income (loss), net of tax	41	41
Ending balance	(3,403)	(3,565)
Foreign currency items
Changes in accumulated other comprehensive income (loss)
Beginning balance	(6,972)	(7,228)
Other comprehensive income (loss) before reclassifications	(157)	(134)
Other comprehensive income (loss), net of tax	(157)	(134)
Ending balance	$ (7,129)	$ (7,362)