Restructuring Restructuring Activity (Details) $ in Thousands	3 Months Ended				6 Months Ended	9 Months Ended				12 Months Ended
	Sep. 30, 2017 USD ($) employee		Sep. 30, 2016 USD ($) employee		Dec. 31, 2015 USD ($)	Sep. 30, 2017 USD ($) employee		Sep. 30, 2016 USD ($) employee		Dec. 31, 2016 USD ($)		Jun. 30, 2015 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated | employee	400		150			750		700
Restructuring Charges	$ 11,503		$ 1,163			$ 18,818		$ 28,378
Restructuring Reserve	9,844				$ 11,069	9,844				$ 16,395		$ 0
Restructuring charges					21,250	18,027	[1]			35,479	[1]
Payments for Restructuring					(9,608)	(25,222)				(29,717)
Restructuring Reserve, Translation Adjustment					(573)	644				(436)
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	7,958	[2]	178	[3]		13,032	[4]	24,556	[5]
Restructuring Reserve	6,529				8,872	6,529				14,135		0
Restructuring charges					18,310	12,241	[1]			29,416	[1]
Payments for Restructuring					(8,862)	(20,463)				(23,729)
Restructuring Reserve, Translation Adjustment					(576)	616				(424)
Asset Impairments Related to Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0		0			0		45
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	3,545		985			5,786		3,777
Restructuring Reserve	3,315				2,197	3,315				2,260		$ 0
Restructuring charges					2,940	5,786	[1]			6,063	[1]
Payments for Restructuring					(746)	(4,759)				(5,988)
Restructuring Reserve, Translation Adjustment					$ 3	28				$ (12)
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] | 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

[1] Excludes stock-based compensation of $0.8 million for the nine months ended September 30, 2017 and $4.6 million for the year ended December 31, 2016 related to accelerated vesting of stock-based compensation awards for certain employees terminated as a result of the Company's restructuring activities.

[2] (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.

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

[4] 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.

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