Employee Benefit Plans - Components of Net Period Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 172	$ 59	$ 78
Interest cost	1,930	2,417	2,907
Expected return on plan assets	(4,168)	(3,533)	(3,010)
Amortization of net loss	1,511	1,624	2,069
Amortization of prior service cost	30	27	28
Effect of settlement	24	134	(10)
Net pension benefit (income) cost	(501)	728	2,062
Pension | Retirement Income Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0
Interest cost	947	1,261	1,590
Expected return on plan assets	(2,384)	(2,002)	(1,760)
Amortization of net loss	873	1,017	1,509
Amortization of prior service cost	0	0	0
Effect of settlement	24	134	0
Net pension benefit (income) cost	(540)	410	1,339
Pension | National Service-Related Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0
Interest cost	936	1,117	1,245
Expected return on plan assets	(1,710)	(1,465)	(1,176)
Amortization of net loss	651	607	564
Amortization of prior service cost	0	0	0
Effect of settlement	0	0	0
Net pension benefit (income) cost	(123)	259	633
Pension | Superannuation
Defined Benefit Plan Disclosure [Line Items]
Service cost	61	59	78
Interest cost	20	25	49
Expected return on plan assets	(74)	(66)	(74)
Amortization of net loss	0	0	0
Amortization of prior service cost	30	27	28
Effect of settlement	0	0	(5)
Net pension benefit (income) cost	37	45	76
Pension | Austria Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	111
Interest cost	19
Expected return on plan assets	0
Amortization of net loss	(13)
Amortization of prior service cost	0
Effect of settlement	0
Net pension benefit (income) cost	117
Other Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0
Interest cost	8	14	23
Expected return on plan assets	0	0	0
Amortization of net loss	0	0	(4)
Amortization of prior service cost	0	0	0
Effect of settlement	0	0	(5)
Net pension benefit (income) cost	$ 8	$ 14	$ 14