Restructuring Restructuring Activity (Details) $ in Thousands	3 Months Ended				6 Months Ended					12 Months Ended
	Jun. 30, 2017 USD ($) employee		Jun. 30, 2016 USD ($) employee		Jun. 30, 2017 USD ($) employee		Jun. 30, 2016 USD ($) employee		Dec. 31, 2015 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2015 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated | employee	150		250		350		550
Restructuring Charges	$ 4,584		$ 15,702		$ 7,315		$ 27,215
Restructuring Reserve	5,511				5,511				$ 11,069	$ 16,395	$ 0
Restructuring charges					7,315				21,250	35,479
Payments for Restructuring					(18,753)				(9,608)	(29,717)
Restructuring Reserve, Translation Adjustment					554				(573)	(436)
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	2,773	[1]	14,053	[2]	5,074	[3]	24,378	[4]
Restructuring Reserve	5,287				5,287				8,872	14,135	0
Restructuring charges					5,074				18,310	29,416
Payments for Restructuring					(14,448)				(8,862)	(23,729)
Restructuring Reserve, Translation Adjustment					526				(576)	(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	1,811		1,649		2,241		2,792
Restructuring Reserve	224				224				2,197	2,260	$ 0
Restructuring charges					2,241				2,940	6,063
Payments for Restructuring					(4,305)				(746)	(5,988)
Restructuring Reserve, Translation Adjustment					28				$ 3	$ (12)
North America [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	2,975		2,806		4,930		8,425
North America [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	2,687		1,488		4,465		6,213
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	288		1,318		465		2,167
EMEA [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	1,609		12,896		2,385		18,790
EMEA [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	86		12,565		609		18,165
EMEA [Member] | Asset Impairments Related to Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0		0		0		0
EMEA [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 1,523		$ 331		$ 1,776		$ 625

[1] (1)The employee severance and benefit costs for the three months ended June 30, 2017 relates to the termination of approximately 150 employees. Substantially all of the remaining cash payments for those costs are expected to be disbursed through December 31, 2017.

[2] The employee severance and benefit costs for the three months ended June 30, 2016 related to the termination of approximately 250 employees.

[3] The employee severance and benefit costs for the six months ended June 30, 2017 relates to the termination of approximately 350 employees. Substantially all of the remaining cash payments for those costs are expected to be disbursed through December 31, 2017.

[4] (1)The employee severance and benefit costs for the six months ended June 30, 2016 related to the termination of approximately 550 employees.