Pension and Postretirement Benefits (Change in Benefit Obligation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Postretirement Medical Benefits
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Balance — January 1	$ 18,648	$ 18,862
Interest cost	399	596	$ 754
Actuarial loss (gain)	1,225	2,434
Benefits paid	(4,192)	(4,167)
Employee contributions	874	916
Medicare subsidies receivable	67	7
Balance — December 31	17,021	18,648	18,862
United States | Pension Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Balance — January 1	487,418	471,462
Service cost	25,162	25,893	23,245
Interest cost	11,952	15,100	17,584
Plan amendments and settlements	0	(953)
Actuarial loss (gain)	(11,208)	29,166
Benefits paid	(41,499)	(53,250)
Balance — December 31	471,825	487,418	471,462
Accumulated benefit obligations	471,024	486,501
Foreign Plan | Pension Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Balance — January 1	469,998	425,617
Service cost	7,336	7,052	5,728
Interest cost	5,544	6,572	8,867
Actuarial loss (gain)	(24,493)	23,781
Benefits paid	(17,316)	(15,700)
Employee contributions	74	80
Settlements and other	(3,140)	(2,701)
Currency translation impact	(17,194)	25,297
Balance — December 31	420,809	469,998	$ 425,617
Accumulated benefit obligations	$ 399,757	$ 446,097