Supplemental Balance Sheet, Income Statement and Cash Flow Information - Accumulated Other Comp Inc (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	$ 1,151,384
Other comprehensive income (loss), net of tax	490	$ 664	$ 17,537
Balance at the end of the period	590,656	1,151,384
Accumulated Other Comprehensive Income
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	(11,124)	(11,788)
Other comprehensive income (loss) before reclassifications	330	435
Amounts reclassified from accumulated other comprehensive income (loss)	160	229
Other comprehensive income (loss), net of tax	490	664
Balance at the end of the period	(10,634)	(11,124)	(11,788)
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	(65)
Amounts reclassified from accumulated other comprehensive income (loss)		67
Other comprehensive income (loss), net of tax		67
Balance at the end of the period	2	2	(65)
Accumulated Defined Benefit Plans Adjustment [Member]
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	(3,616)	(3,778)
Other comprehensive income (loss) before reclassifications	(1,900)
Amounts reclassified from accumulated other comprehensive income (loss)	160	162
Other comprehensive income (loss), net of tax	(1,740)	162
Balance at the end of the period	(5,356)	(3,616)	(3,778)
Accumulated Translation Adjustment [Member]
Changes in accumulated other comprehensive income (loss)
Balance at the beginning of the period	(7,510)	(7,945)
Other comprehensive income (loss) before reclassifications	2,230	435
Other comprehensive income (loss), net of tax	2,230	435
Balance at the end of the period	$ (5,280)	$ (7,510)	$ (7,945)