Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract]
Amortization of net actuarial loss, gross amount	$ 41	$ 688	$ 60	$ 1,683
Amortization of net actuarial loss, income tax provision	(11)	(174)	(17)	(424)
Amortization of net actuarial loss, net amount	30	514	43	1,259
Actuarial gains, gross amount	5,472	4,128	5,472	4,128
Actuarial gains, income tax provision	(1,371)	(1,035)	(1,371)	(1,035)
Actuarial gains, net amount	4,101	3,093	4,101	3,093
Foreign currency translation, gross amount	(611)	(86)	(135)	(583)
Foreign currency translation, income tax provision	0	0	0	0
Foreign currency translation, net amount	(611)	(86)	(135)	(583)
Total other comprehensive income, gross amount	4,902	4,730	5,397	5,228
Total other comprehensive income, income tax provision	(1,382)	(1,209)	(1,388)	(1,459)
Total other comprehensive income, net of taxes	$ 3,520	$ 3,521	$ 4,009	$ 3,769