Employee Benefit Plans - Actuarial Assumptions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Change in benefit obligation:
Beginning balance	$ (87,806)	$ (82,014)
Purchase price allocation adjustment	(2,498)
Service cost	(166)	(66)
Interest cost	(1,928)	(2,420)
Actuarial gain (loss)	3,260	(6,903)
Benefits paid	2,572	2,459
Other - plan change	0
Plan participants’ contributions	(18)	(19)
Foreign currency translation loss (gain)	42	(109)
Effect of settlement	1,850	1,266
Ending balance	(84,692)	(87,806)	$ (82,014)
Change in plan assets:
Beginning balance	78,661	69,308
Purchase price allocation adjustment	1,112
Actual return on plan assets	7,904	9,981
Employer contributions	1,240	2,949
Benefits paid	(2,575)	(2,459)
Effect of settlement	(1,850)	(1,266)
Plan participants’ contributions	34	19
Foreign currency translation gain	(243)	129
Ending balance	84,283	78,661	69,308
Funded status	(409)	(9,145)
Amounts recognized on the consolidated balance sheet:
Pension and post-retirement asset (liability)	(409)	(9,145)
Accumulated other comprehensive loss (income)	1,246	9,586
Amounts in accumulated other comprehensive loss consist of:
Net loss	1,224	9,586
Prior service cost	22	53
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss:
Net (gain) loss	(6,821)	342
Amortization of net gain	(1,524)	(1,624)
Amortization of prior service cost	(30)	(31)
Amount recognized due to settlement	(24)	(134)
Foreign currency translation loss	70	14
Total recognized in other comprehensive (income) loss	(8,329)	(1,433)	(3,269)
Information for plans with accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	40,999	87,806
Accumulated benefit obligation	40,519	87,679
Fair value of plan assets	37,405	78,661
Pension
Change in plan assets:
Beginning balance	78,661
Ending balance	84,283	78,661
Other Post-Retirement Benefits
Change in benefit obligation:
Beginning balance	(647)	(611)
Purchase price allocation adjustment	0
Service cost	0	0
Interest cost	(8)	(14)
Actuarial gain (loss)	21	(27)
Benefits paid	5	5
Other - plan change	0
Plan participants’ contributions	0	0
Foreign currency translation loss (gain)	0	0
Effect of settlement	0	0
Ending balance	(629)	(647)	(611)
Change in plan assets:
Beginning balance	0	0
Purchase price allocation adjustment	0
Actual return on plan assets	0	0
Employer contributions	5	5
Benefits paid	(5)	(5)
Effect of settlement	0	0
Plan participants’ contributions	0	0
Foreign currency translation gain	0	0
Ending balance	0	0	0
Funded status	(629)	(647)
Amounts recognized on the consolidated balance sheet:
Pension and post-retirement asset (liability)	(629)	(647)
Accumulated other comprehensive loss (income)	(15)	6
Amounts in accumulated other comprehensive loss consist of:
Net loss	(15)	6
Prior service cost	0	0
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss:
Net (gain) loss	(28)	(94)
Amortization of net gain	0	0
Amortization of prior service cost	0	0
Amount recognized due to settlement	0	0
Foreign currency translation loss	0	0
Total recognized in other comprehensive (income) loss	(28)	(94)
Information for plans with accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	629	647
Accumulated benefit obligation	629	647
Fair value of plan assets	0	0
Retirement Income Plan | Pension
Change in benefit obligation:
Beginning balance	(47,509)	(45,215)
Purchase price allocation adjustment	0
Service cost	0	0
Interest cost	(947)	(1,261)
Actuarial gain (loss)	1,571	(3,657)
Benefits paid	1,342	1,358
Other - plan change	0
Plan participants’ contributions	0	0
Foreign currency translation loss (gain)	0	0
Effect of settlement	1,850	1,266
Ending balance	(43,693)	(47,509)	(45,215)
Change in plan assets:
Beginning balance	45,030	40,111
Purchase price allocation adjustment	0
Actual return on plan assets	4,371	5,903
Employer contributions	669	1,640
Benefits paid	(1,342)	(1,358)
Effect of settlement	(1,850)	(1,266)
Plan participants’ contributions	0	0
Foreign currency translation gain	0	0
Ending balance	46,878	45,030	40,111
Funded status	3,185	(2,479)
Amounts recognized on the consolidated balance sheet:
Pension and post-retirement asset (liability)	3,185
Pension and post-retirement asset (liability)		(2,479)
Accumulated other comprehensive loss (income)	566	5,021
Amounts in accumulated other comprehensive loss consist of:
Net loss	566	5,021
Prior service cost	0	0
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss:
Net (gain) loss	(3,558)	(244)
Amortization of net gain	(873)	(1,017)
Amortization of prior service cost	0	0
Amount recognized due to settlement	(24)	(134)
Foreign currency translation loss	0	0
Total recognized in other comprehensive (income) loss	(4,455)	(1,395)
Information for plans with accumulated benefit obligation in excess of plan assets:
Projected benefit obligation		47,509
Accumulated benefit obligation		47,508
Fair value of plan assets		45,030
National Service-Related Pension Plan | Pension
Change in benefit obligation:
Beginning balance	(38,227)	(35,036)
Purchase price allocation adjustment	0
Service cost	0	0
Interest cost	(936)	(1,117)
Actuarial gain (loss)	1,592	(3,147)
Benefits paid	1,150	1,073
Other - plan change	0
Plan participants’ contributions	0	0
Foreign currency translation loss (gain)	0	0
Effect of settlement	0	0
Ending balance	(36,421)	(38,227)	(35,036)
Change in plan assets:
Beginning balance	32,061	27,841
Purchase price allocation adjustment	0
Actual return on plan assets	3,187	4,034
Employer contributions	505	1,259
Benefits paid	(1,150)	(1,073)
Effect of settlement	0	0
Plan participants’ contributions	0	0
Foreign currency translation gain	0	0
Ending balance	34,603	32,061	27,841
Funded status	(1,818)	(6,166)
Amounts recognized on the consolidated balance sheet:
Pension and post-retirement asset (liability)	(1,818)	(6,166)
Accumulated other comprehensive loss (income)	752	4,473
Amounts in accumulated other comprehensive loss consist of:
Net loss	752	4,473
Prior service cost	0	0
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss:
Net (gain) loss	(3,069)	578
Amortization of net gain	(651)	(607)
Amortization of prior service cost	0	0
Amount recognized due to settlement	0	0
Foreign currency translation loss	0	0
Total recognized in other comprehensive (income) loss	(3,720)	(29)
Information for plans with accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	36,421	38,227
Accumulated benefit obligation	36,421	38,227
Fair value of plan assets	34,603	32,061
Superannuation | Pension
Change in benefit obligation:
Beginning balance	(1,423)	(1,152)
Purchase price allocation adjustment	0
Service cost	(59)	(66)
Interest cost	(19)	(28)
Actuarial gain (loss)	78	(72)
Benefits paid	14	23
Other - plan change	0
Plan participants’ contributions	(18)	(19)
Foreign currency translation loss (gain)	80	(109)
Effect of settlement	0	0
Ending balance	(1,347)	(1,423)	(1,152)
Change in plan assets:
Beginning balance	1,570	1,356
Purchase price allocation adjustment	0
Actual return on plan assets	320	44
Employer contributions	0	45
Benefits paid	(27)	(23)
Effect of settlement	0	0
Plan participants’ contributions	34	19
Foreign currency translation gain	(243)	129
Ending balance	1,654	1,570	$ 1,356
Funded status	307	147
Amounts recognized on the consolidated balance sheet:
Pension and post-retirement asset (liability)	307	147
Accumulated other comprehensive loss (income)	(72)	86
Amounts in accumulated other comprehensive loss consist of:
Net loss	(94)	86
Prior service cost	22	53
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss:
Net (gain) loss	(181)	102
Amortization of net gain	0	0
Amortization of prior service cost	(30)	(31)
Amount recognized due to settlement	0	0
Foreign currency translation loss	70	14
Total recognized in other comprehensive (income) loss	(141)	85
Information for plans with accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	1,347	1,423
Accumulated benefit obligation	1,272	1,297
Fair value of plan assets	1,654	1,570
Austria Plans | Pension
Change in benefit obligation:
Beginning balance	0
Purchase price allocation adjustment	(2,498)
Service cost	(107)
Interest cost	(18)
Actuarial gain (loss)	(2)
Benefits paid	61
Other - plan change	0
Plan participants’ contributions	0
Foreign currency translation loss (gain)	(38)
Effect of settlement	0
Ending balance	(2,602)	0
Change in plan assets:
Beginning balance	0
Purchase price allocation adjustment	1,112
Actual return on plan assets	26
Employer contributions	61
Benefits paid	(51)
Effect of settlement	0
Plan participants’ contributions	0
Foreign currency translation gain	0
Ending balance	1,148	$ 0
Funded status	(1,454)
Amounts recognized on the consolidated balance sheet:
Pension and post-retirement asset (liability)	(1,454)
Accumulated other comprehensive loss (income)	15
Amounts in accumulated other comprehensive loss consist of:
Net loss	15
Prior service cost	0
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss:
Net (gain) loss	15
Amortization of net gain	0
Amortization of prior service cost	0
Amount recognized due to settlement	0
Foreign currency translation loss	0
Total recognized in other comprehensive (income) loss	15
Information for plans with accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	2,602
Accumulated benefit obligation	2,197
Fair value of plan assets	$ 1,148