Segment Information (Schedule of Fixed Assets by Geographic Location) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 163,860	$ 133,844
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	93,951	79,832
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	48,043	33,380
Other Geographic Locations [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 21,866	$ 20,632