Restructuring Expected Costs - 2016 Projects (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 7,262	$ 87,865
2016 Projects [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	55,652
Restructuring and Related Cost, Cost Incurred to Date			$ 53,272
Restructuring	1,630
Remaining Costs to be Recognized at Period End	750
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	2,224
Employee Severance [Member] | 2016 Projects [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	36,274
Restructuring and Related Cost, Cost Incurred to Date			35,845
Restructuring	429
Remaining Costs to be Recognized at Period End	0
Asset Impairment and Net (Gain) Loss on Sale or Disposal [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	96
Asset Impairment and Net (Gain) Loss on Sale or Disposal [Member] | 2016 Projects [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	5,659
Restructuring and Related Cost, Cost Incurred to Date			5,664
Restructuring	(5)
Remaining Costs to be Recognized at Period End	0
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring	4,942
Other Restructuring [Member] | 2016 Projects [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	13,719
Restructuring and Related Cost, Cost Incurred to Date			$ 11,763
Restructuring	1,206
Remaining Costs to be Recognized at Period End	$ 750