Pension and Other Postretirement Benefits - Cash Flow (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Minimum Cash Contributions, Next Fiscal Year	$ 5,200
Expected Benefit Payments, Next Twelve Months	6,755
Expected Benefit Payments, Year Two	6,729
Expected Benefit Payments, Year Three	7,386
Expected Benefit Payments, Year Four	7,361
Expected Benefit Payments, Year Five	8,196
Expected Benefit Payments, Five Fiscal Years Thereafter	41,319
Domestic [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Minimum Cash Contributions, Next Fiscal Year	500
Expected Benefit Payments, Next Twelve Months	4,515
Expected Benefit Payments, Year Two	4,286
Expected Benefit Payments, Year Three	4,220
Expected Benefit Payments, Year Four	4,237
Expected Benefit Payments, Year Five	4,860
Expected Benefit Payments, Five Fiscal Years Thereafter	22,107
Domestic [Member] | Other Postretirement Benefit Plans Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Minimum Cash Contributions, Next Fiscal Year	400
Expected Benefit Payments, Next Twelve Months	446
Expected Benefit Payments, Year Two	422
Expected Benefit Payments, Year Three	393
Expected Benefit Payments, Year Four	367
Expected Benefit Payments, Year Five	349
Expected Benefit Payments, Five Fiscal Years Thereafter	1,380
Foreign [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Minimum Cash Contributions, Next Fiscal Year	4,700
Expected Benefit Payments, Next Twelve Months	2,240
Expected Benefit Payments, Year Two	2,443
Expected Benefit Payments, Year Three	3,166
Expected Benefit Payments, Year Four	3,124
Expected Benefit Payments, Year Five	3,336
Expected Benefit Payments, Five Fiscal Years Thereafter	$ 19,212