Goodwill and Other Intangible Assets Goodwill Activity by Segment (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 274,551
Foreign currency translation	7,460
Goodwill, end of period	282,011
North America [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period	178,685
Foreign currency translation	0
Goodwill, end of period	178,685
EMEA [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period	89,747
Goodwill (Increase) Decrease, due to Segment Reallocation	(89,747)
ROW [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period	6,119
Goodwill (Increase) Decrease, due to Segment Reallocation	(6,119)
International [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period	0
Foreign currency translation	7,460
Goodwill, end of period	103,326
Goodwill (Increase) Decrease, due to Segment Reallocation	$ 95,866