Benefit Plans Net Periodic Pension Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	$ 16,597	$ 16,635	$ 16,906
Defined Benefit Plan, Interest Cost	14,841	12,938	12,955
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	35,049	37,934	37,086
Amortization of Actuarial (Gains) Losses and Plan Amendments	15,467	18,756	20,129
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	11,856	10,395	12,904
Pension Plan [Member] | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	15,534	15,545	16,341
Defined Benefit Plan, Interest Cost	10,192	8,630	8,511
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	29,162	31,005	30,349
Amortization of Actuarial (Gains) Losses and Plan Amendments	13,784	14,575	16,247
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	10,348	7,745	10,750
Pension Plan [Member] | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Service Cost	1,063	1,090	565
Defined Benefit Plan, Interest Cost	4,585	4,242	4,374
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	5,887	6,929	6,737
Amortization of Actuarial (Gains) Losses and Plan Amendments	2,374	5,804	6,556
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	2,135	4,207	4,758
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	64	66	70
Amortization of Actuarial (Gains) Losses and Plan Amendments	(691)	(1,623)	(2,674)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ (627)	$ (1,557)	$ (2,604)