Benefit Plans Change in Benefit Benefit Obligation and Plan Assets - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation	$ 1,242,788	$ 1,105,008	$ 996,483
Defined Benefit Plans, Service Cost and Other	35,299	31,728
Defined Benefit Plan, Interest Cost	8,359	14,841	12,938
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	54,171	98,582
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	112	(576)
Defined Benefit Plan, Benefit Obligation, Benefits Paid	47,728	46,280
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss)	87,567	10,230
Defined Benefit Plan, Plan Assets, Amount	1,093,784	964,774	862,951
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	48,758	91,769
Defined Benefit Plan, Plan Assets, Contributions by Employer	31,992	25,656
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant	15,681	15,130
Defined Benefit Plan, Plan Assets, Benefits Paid	47,728	46,280
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)	80,307	15,548
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(149,004)	(140,234)
Pension Plan [Member] \| Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation	1,091,811	961,263	864,095
Defined Benefit Plans, Service Cost and Other	33,995	30,665
Defined Benefit Plan, Interest Cost	4,778	10,192	8,630
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	43,508	84,262
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	112	0
Defined Benefit Plan, Benefit Obligation, Benefits Paid	39,412	38,181
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss)	87,567	10,230
Defined Benefit Plan, Plan Assets, Amount	984,322	861,962	767,410
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	39,535	76,732
Defined Benefit Plan, Plan Assets, Contributions by Employer	26,249	25,323
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant	15,681	15,130
Defined Benefit Plan, Plan Assets, Benefits Paid	39,412	38,181
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)	80,307	15,548
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(107,489)	(99,301)
Pension Plan [Member] \| UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation	149,947	142,450	130,202
Defined Benefit Plans, Service Cost and Other	1,304	1,063
Defined Benefit Plan, Interest Cost	3,556	4,585	4,242
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	10,733	14,449
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	0	0
Defined Benefit Plan, Benefit Obligation, Benefits Paid	8,096	7,849
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss)	0	0
Defined Benefit Plan, Plan Assets, Amount	109,462	102,812	95,541
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	9,223	15,037
Defined Benefit Plan, Plan Assets, Contributions by Employer	5,523	83
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant	0	0
Defined Benefit Plan, Plan Assets, Benefits Paid	8,096	7,849
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)	0	0
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(40,485)	(39,638)
Other Postretirement Benefits Plan [Member] \| UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation	1,030	1,295	2,186
Defined Benefit Plans, Service Cost and Other	0	0
Defined Benefit Plan, Interest Cost	25	64	66
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(70)	(129)
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	0	(576)
Defined Benefit Plan, Benefit Obligation, Benefits Paid	220	250
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss)	0	0
Defined Benefit Plan, Plan Assets, Amount	0	0	$ 0
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	0	0
Defined Benefit Plan, Plan Assets, Contributions by Employer	220	250
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant	0	0
Defined Benefit Plan, Plan Assets, Benefits Paid	220	250
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)	0	0
Defined Benefit Plan, Funded (Unfunded) Status of Plan	$ (1,030)	$ (1,295)

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period and other deminimus expenses. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

No definition available.