Pensions and Other Postretirement Benefits (Components of Net Periodic Cost of Pension and Other Postretirement Benefit Plans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost	$ 468	$ 738	$ 643
Pension Plans | United States
Defined Benefit Plan Disclosure [Line Items]
Annual service cost	0	0	0
Contributions by participants	0	0	0
Net service cost	0	0	0
Interest cost	57	70	85
Expected return on plan assets	0	0	0
Amortization of actuarial losses	27	109	38
Amortization of transition obligation	0	0	0
Curtailment and settlement losses	0	0	0
Net periodic benefit cost	84	179	123
Pension Plans | Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Annual service cost	379	402	336
Contributions by participants	0	0	0
Net service cost	379	402	336
Interest cost	353	442	535
Expected return on plan assets	(393)	(442)	(517)
Amortization of actuarial losses	459	286	164
Amortization of transition obligation	(8)	5	1
Curtailment and settlement losses	(108)	0	0
Net periodic benefit cost	682	693	519
OPEB Plans
Defined Benefit Plan Disclosure [Line Items]
Contributions by participants	0	25
Net service cost	36	123	126
Interest cost	68	133	180
Amortization of actuarial losses	20	137	156
Net periodic benefit cost	$ 124	$ 393	$ 462