Benefit Plans Net Periodic Pension Costs - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	$ 19,618	$ 16,597	$ 16,635
Defined Benefit Plan, Interest Cost	8,359	14,841	12,938
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	39,161	35,049	37,934
Amortization of Actuarial (Gains) Losses and Plan Amendments	18,609	15,467	18,756
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	7,425	11,856	10,395
Pension Plan [Member] | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	18,314	15,534	15,545
Defined Benefit Plan, Interest Cost	4,778	10,192	8,630
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	33,067	29,162	31,005
Amortization of Actuarial (Gains) Losses and Plan Amendments	16,134	13,784	14,575
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	6,159	10,348	7,745
Pension Plan [Member] | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	1,304	1,063	1,090
Defined Benefit Plan, Interest Cost	3,556	4,585	4,242
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	6,094	5,887	6,929
Amortization of Actuarial (Gains) Losses and Plan Amendments	2,578	2,374	5,804
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	1,344	2,135	4,207
Other Postretirement Benefits Plan [Member] | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	0	0	0
Defined Benefit Plan, Interest Cost	25	64	66
Amortization of Actuarial (Gains) Losses and Plan Amendments	(103)	(691)	(1,623)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ (78)	$ (627)	$ (1,557)