Pension and Other Postretirement Benefits - Cash Flow (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Minimum Cash Contributions, Next Fiscal Year	$ 7,800
Expected Benefit Payments, Next Twelve Months	6,709
Expected Benefit Payments, Year Two	6,588
Expected Benefit Payments, Year Three	6,699
Expected Benefit Payments, Year Four	6,665
Expected Benefit Payments, Year Five	7,268
Expected Benefit Payments, Five Fiscal Years Thereafter	40,026
Domestic [Member]
Defined Benefit Plan Disclosure [Line Items]
Minimum Cash Contributions, Next Fiscal Year	4,600
Expected Benefit Payments, Next Twelve Months	4,929
Expected Benefit Payments, Year Two	4,642
Expected Benefit Payments, Year Three	4,605
Expected Benefit Payments, Year Four	4,354
Expected Benefit Payments, Year Five	4,346
Expected Benefit Payments, Five Fiscal Years Thereafter	23,445
Foreign [Member]
Defined Benefit Plan Disclosure [Line Items]
Minimum Cash Contributions, Next Fiscal Year	3,200
Expected Benefit Payments, Next Twelve Months	1,780
Expected Benefit Payments, Year Two	1,946
Expected Benefit Payments, Year Three	2,094
Expected Benefit Payments, Year Four	2,311
Expected Benefit Payments, Year Five	2,922
Expected Benefit Payments, Five Fiscal Years Thereafter	16,581
Domestic Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Minimum Cash Contributions, Next Fiscal Year	500
Expected Benefit Payments, Next Twelve Months	451
Expected Benefit Payments, Year Two	444
Expected Benefit Payments, Year Three	432
Expected Benefit Payments, Year Four	407
Expected Benefit Payments, Year Five	385
Expected Benefit Payments, Five Fiscal Years Thereafter	$ 1,611