Benefit Plans Amounts Recognized in the Balance Sheet (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Assets for Plan Benefits, Defined Benefit Plan	$ 44,536	$ 46,014
Liability, Defined Benefit Plan, Current	5,388	5,425
Liability, Defined Benefit Plan, Noncurrent	179,382	174,121
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	349,715	321,254
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax	209,481	187,722
Pension Plan [Member] | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Assets for Plan Benefits, Defined Benefit Plan	44,536	46,014
Liability, Defined Benefit Plan, Current	5,023	4,884
Liability, Defined Benefit Plan, Noncurrent	138,813	137,815
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	286,370	260,820
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax	187,070	164,135
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	126	110
Liability, Defined Benefit Plan, Noncurrent	39,512	34,551
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	64,269	61,344
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax	24,631	26,683
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	239	431
Liability, Defined Benefit Plan, Noncurrent	1,057	1,755
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	(924)	(910)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax	$ (2,220)	$ (3,096)