Description of Business and Summary of Significant Accounting Policies (Goodwill) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Business Combination Segment Allocation [Line Items]
Document Period End Date	Mar. 31, 2016
Goodwill [Roll Forward]
Beginning Balance	$ 402,259	$ 402,220
Additions, net	0	8,868
Goodwill, Purchase Accounting Adjustments	0	(2,099)
Goodwill, Transfers	0	(1,783)
Foreign currency translation adjustments	951	(4,947)
Ending Balance	$ 403,210	$ 402,259