Benefit Plans Amounts Recognized in the Balance Sheet - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Assets for Plan Benefits, Defined Benefit Plan	$ 51,619	$ 44,536
Liability, Defined Benefit Plan, Current	5,835	5,388
Liability, Defined Benefit Plan, Noncurrent	194,789	179,382
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	400,685	349,715
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax	251,680	209,481
Pension Plan [Member] | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets for Plan Benefits, Defined Benefit Plan	51,619	44,536
Liability, Defined Benefit Plan, Current	5,549	5,023
Liability, Defined Benefit Plan, Noncurrent	153,559	138,813
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	332,280	286,370
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax	224,791	187,070
Pension Plan [Member] | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Assets for Plan Benefits, Defined Benefit Plan	0	0
Liability, Defined Benefit Plan, Current	133	126
Liability, Defined Benefit Plan, Noncurrent	40,353	39,512
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	69,296	64,269
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax	28,810	24,631
Other Postretirement Benefits Plan [Member] | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Assets for Plan Benefits, Defined Benefit Plan	0	0
Liability, Defined Benefit Plan, Current	153	239
Liability, Defined Benefit Plan, Noncurrent	877	1,057
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	(891)	(924)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax	$ (1,921)	$ (2,220)