General and Basis of Presentation - Restructuring (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2017	Sep. 30, 2017
Restructuring Expenses
Asset impairment charges	$ 3,200
Restructuring Reserve [Roll Forward]
Restructuring expenses	8,200	$ 8,243
Payments		(3,938)
Restructuring Reserve, Ending Balance		4,305
Accrued Liabilities
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Ending Balance		2,941
Other Long-Term Liabilities [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Ending Balance		1,364
Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring expenses	8,000
Lease Termination [Member]
Restructuring Reserve [Roll Forward]
Restructuring expenses	$ 200
North America Segment
Restructuring Reserve [Roll Forward]
Restructuring expenses		3,668
Europe And Africa Segment
Restructuring Reserve [Roll Forward]
Restructuring expenses		831
Restructuring Reserve, Ending Balance		510
Europe And Africa Segment | Accrued Liabilities
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Ending Balance		510
Corporate Segment [Member]
Restructuring Reserve [Roll Forward]
Restructuring expenses		3,744
Restructuring Reserve, Ending Balance		3,795
Corporate Segment [Member] | Accrued Liabilities
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Ending Balance		2,431
Corporate Segment [Member] | Other Long-Term Liabilities [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Ending Balance		$ 1,364