Supplemental Balance Sheet, Income Statement and Cash Flow Information - Accumulated Other Comp Inc (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	$ 590,656
Other comprehensive income (loss), net of tax	1,336	$ 368
Balance at the end of the period	543,616
Accumulated Other Comprehensive Income
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	(10,634)	(11,124)
Other comprehensive income (loss) before reclassifications	1,296	328
Amounts reclassified from accumulated other comprehensive income (loss)	40	40
Other comprehensive income (loss), net of tax	1,336	368
Balance at the end of the period	(9,298)	(10,756)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	2	2
Balance at the end of the period	2	2
Accumulated Defined Benefit Plans Adjustment [Member]
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	(5,356)	(3,616)
Other comprehensive income (loss) before reclassifications	1,428	(1,900)
Amounts reclassified from accumulated other comprehensive income (loss)	40	40
Other comprehensive income (loss), net of tax	1,468	(1,860)
Balance at the end of the period	(3,888)	(5,476)
Accumulated Translation Adjustment [Member]
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	(5,280)	(7,510)
Other comprehensive income (loss) before reclassifications	(132)	2,228
Other comprehensive income (loss), net of tax	(132)	2,228
Balance at the end of the period	$ (5,412)	$ (5,282)