Pension and Postretirement Benefits (Change in Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Postretirement Medical Benefits
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract]
Balance — January 1	$ (1,213)	$ 656
Amortization of net loss	(16)	(101)
Amortization of prior service cost	94	94
Net gain (loss) arising during the year	(937)	(1,862)
Prior service cost arising during the year	(122)	(122)	$ (122)
Balance — December 31	(2,072)	(1,213)	656
United States | Pension Plan
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract]
Balance — January 1	(49,321)	(49,510)
Amortization of net loss	5,907	5,336
Amortization of prior service cost	144	140
Net gain (loss) arising during the year	13,256	(5,328)
Settlement gain	0	98
Prior service cost arising during the year	0	(57)
Balance — December 31	(30,014)	(49,321)	(49,510)
Foreign Plan | Pension Plan
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract]
Balance — January 1	(97,246)	(89,337)
Amortization of net loss	4,207	4,410
Net gain (loss) arising during the year	17,995	(7,432)
Prior service cost arising during the year	(300)	(262)	(265)
Settlement losses	616	681
Prior service cost arising during the year	0	(467)
Currency translation impact and other	3,847	(5,101)
Balance — December 31	$ (70,581)	$ (97,246)	$ (89,337)