Supplemental Balance Sheet and Income Statement Information - Accumulated other comprehensive income (loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Changes in accumulated other comprehensive income (loss)
Beginning balance			$ 134,996
Other comprehensive income (loss), net of tax	$ (294)	$ 88	(548)	$ (12)
Ending balance	579,776		579,776
Accumulated Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive income (loss)
Beginning balance			(10,414)	(10,832)
Other comprehensive income (loss) before reclassifications			(669)	(133)
Amounts reclassified from accumulated other comprehensive income (loss)			121	121
Other comprehensive income (loss), net of tax			(548)	(12)
Ending balance	(10,962)	(10,844)	(10,962)	(10,844)
Gains (losses) on cash flow hedges
Changes in accumulated other comprehensive income (loss)
Beginning balance			2	2
Ending balance	2	2	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)			121	121
Other comprehensive income (loss), net of tax			121	121
Ending balance	(3,323)	(3,485)	(3,323)	(3,485)
Foreign currency items
Changes in accumulated other comprehensive income (loss)
Beginning balance			(6,972)	(7,228)
Other comprehensive income (loss) before reclassifications			(669)	(133)
Other comprehensive income (loss), net of tax			(669)	(133)
Ending balance	$ (7,641)	$ (7,361)	$ (7,641)	$ (7,361)