Restructuring Expected Costs - 2016 Projects (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring	$ (6,169)	$ (5,623)	$ 1,093	$ 82,242
2016 Projects [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	50,608		50,608
Restructuring and Related Cost, Cost Incurred to Date					$ 53,272
Restructuring			(3,364)
Remaining Costs to be Recognized at Period End	700		700
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring			(605)
Employee Severance [Member] | 2016 Projects [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	36,283		36,283
Restructuring and Related Cost, Cost Incurred to Date					35,845
Restructuring			438
Remaining Costs to be Recognized at Period End	0		0
Asset Impairment and Net (Gain) Loss on Sale or Disposal [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring			(5,295)
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	255		255
Restructuring and Related Cost, Cost Incurred to Date					5,664
Restructuring			(5,409)
Remaining Costs to be Recognized at Period End	0		0
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring			6,993
Other Restructuring [Member] | 2016 Projects [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	14,070		14,070
Restructuring and Related Cost, Cost Incurred to Date					$ 11,763
Restructuring			1,607
Remaining Costs to be Recognized at Period End	700		$ 700
Stretford [Member]
Restructuring Cost and Reserve [Line Items]
Gain (Loss) on Sale of Properties	$ 5,400