Goodwill and Other Intangible Assets Goodwill Activity by Segment (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 274,551
Foreign currency translation	10,885
Goodwill, end of period	285,436
Goodwill (Increase) Decrease, due to Segment Reallocation	0
North America [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period	178,685
Foreign currency translation	0
Goodwill, end of period	178,685
Goodwill (Increase) Decrease, due to Segment Reallocation	0
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	10,885
Goodwill, end of period	106,751
Goodwill (Increase) Decrease, due to Segment Reallocation	$ 95,866