General and Basis of Presentation - Restructuring (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2017
Restructuring Reserve [Roll Forward]
Restructuring expenses	$ 0	$ 8,200	$ 8,243
Payments			2,274
Restructuring Reserve, Ending Balance	5,969		5,969
Loss on Disposal and Impairment of Assets
Restructuring Expenses
Asset impairment charges	0	3,200
Current Portion Of Other Long-Term Liabilities [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Ending Balance	70		70
Accrued Liabilities
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Ending Balance	4,482		4,482
Other Long-Term Liabilities [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Ending Balance	1,417		1,417
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
Restructuring Reserve, Ending Balance	21		21
North America Segment | Current Portion Of Other Long-Term Liabilities [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Ending Balance	21		21
Europe & Africa Segment
Restructuring Reserve [Roll Forward]
Restructuring expenses			831
Restructuring Reserve, Ending Balance	495		495
Europe & Africa Segment | Accrued Liabilities
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Ending Balance	495		495
Corporate Segment [Member]
Restructuring Reserve [Roll Forward]
Restructuring expenses			3,744
Restructuring Reserve, Ending Balance	5,453		5,453
Corporate Segment [Member] | Current Portion Of Other Long-Term Liabilities [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Ending Balance	49		49
Corporate Segment [Member] | Accrued Liabilities
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Ending Balance	3,987		3,987
Corporate Segment [Member] | Other Long-Term Liabilities [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Ending Balance	$ 1,417		$ 1,417