Restructuring Restructuring Details (Details) $ in Thousands	3 Months Ended				9 Months Ended				12 Months Ended
	Sep. 30, 2017 USD ($) employee		Sep. 30, 2016 USD ($) employee		Sep. 30, 2017 USD ($) employee		Sep. 30, 2016 USD ($) employee		Dec. 31, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 11,503		$ 1,163		$ 18,818		$ 28,378
Restructuring and Related Cost, Number of Positions Eliminated | employee	400		150		750		700
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 7,958	[1]	$ 178	[2]	$ 13,032	[3]	$ 24,556	[4]
Restructuring Costs					80,200
Share Distribution [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges					800				$ 4,600
Asset Impairments Related to Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0		0		0		45
Restructuring Costs					7,500
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	3,545		985		5,786		3,777
North America [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	6,971		969		11,901		9,394
North America [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	3,662		274		8,127		6,487
North America [Member] | Share Distribution [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	800				800		2,600
North America [Member] | Asset Impairments Related to Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0		0		0		45
North America [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 3,309		695		$ 3,774		2,862
ROW [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Number of Countries in which Entity Operates	17				17
International [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 4,532		194		$ 6,917		18,984
International [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	4,296		(96)		4,905		18,069
International [Member] | Share Distribution [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges							2,100
International [Member] | Asset Impairments Related to Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0		0		0		0
International [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 236		$ 290		2,012		$ 915
OrderUp Intangibles [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs					$ 2,600

[1] (1)The employee severance and benefit costs for the three months ended September 30, 2017 relates to the termination of approximately 400 employees. Substantially all of the remaining cash payments for those costs are expected to be disbursed through April 30, 2018.

[2] The employee severance and benefit costs for the three months ended September 30, 2016 related to the termination of approximately 150 employees.

[3] The employee severance and benefit costs for the nine months ended September 30, 2017 relates to the termination of approximately 750 employees. Substantially all of the remaining cash payments for those costs are expected to be disbursed through April 30, 2018.

[4] (1)The employee severance and benefit costs for the nine months ended September 30, 2016 related to the termination of approximately 700 employees.