Benefit Plans Change in Benefit Benefit Obligation and Plan Assets (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, Benefit Obligation	$ 1,105,008	$ 996,483	$ 1,063,722
Defined Benefit Plans, Service Cost and Other	31,728	31,811
Defined Benefit Plan, Interest Cost	14,841	12,938	12,955
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	98,582	(50,655)
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	(576)	966
Defined Benefit Plan, Benefit Obligation, Benefits Paid	46,280	44,439
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss)	10,230	(17,860)
Defined Benefit Plan, Plan Assets, Amount	964,774	862,951	919,782
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	91,769	(42,521)
Defined Benefit Plan, Plan Assets, Contributions by Employer	25,656	26,334
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant	15,130	15,327
Defined Benefit Plan, Plan Assets, Benefits Paid	46,280	44,439
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)	15,548	(11,532)
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(140,234)	(133,532)
Pension Plan [Member] | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation	961,263	864,095	918,478
Defined Benefit Plans, Service Cost and Other	30,665	30,721
Defined Benefit Plan, Interest Cost	10,192	8,630	8,511
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	84,262	(40,469)
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	0	974
Defined Benefit Plan, Benefit Obligation, Benefits Paid	38,181	36,379
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss)	10,230	(17,860)
Defined Benefit Plan, Plan Assets, Amount	861,962	767,410	808,215
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	76,732	(34,102)
Defined Benefit Plan, Plan Assets, Contributions by Employer	25,323	26,032
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant	15,130	15,176
Defined Benefit Plan, Plan Assets, Benefits Paid	38,181	36,379
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)	15,548	(11,532)
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(99,301)	(96,685)
Pension Plan [Member] | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation	142,450	130,202	142,571
Defined Benefit Plans, Service Cost and Other	1,063	1,090
Defined Benefit Plan, Interest Cost	4,585	4,242	4,374
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	14,449	(10,019)
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	0	0
Defined Benefit Plan, Benefit Obligation, Benefits Paid	7,849	7,682
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss)	0	0
Defined Benefit Plan, Plan Assets, Amount	102,812	95,541	111,567
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	15,037	(8,419)
Defined Benefit Plan, Plan Assets, Contributions by Employer	83	75
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant	0	0
Defined Benefit Plan, Plan Assets, Benefits Paid	7,849	7,682
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)	0	0
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(39,638)	(34,661)
Other Postretirement Benefits Plan [Member] | UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation	1,295	2,186	2,673
Defined Benefit Plans, Service Cost and Other	0	0
Defined Benefit Plan, Interest Cost	64	66	70
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(129)	(167)
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	(576)	(8)
Defined Benefit Plan, Benefit Obligation, Benefits Paid	250	378
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	250	227
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant	0	151
Defined Benefit Plan, Plan Assets, Benefits Paid	250	378
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)	0	0
Defined Benefit Plan, Funded (Unfunded) Status of Plan	$ (1,295)	$ (2,186)