Segment Reporting and Major Customers - Property and Equipment, Net of Accumulated Depreciation and Amortization (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Property and equipment, net of accumulated depreciation and amortization	$ 281,733	$ 289,898
United States
Segment Reporting Information [Line Items]
Property and equipment, net of accumulated depreciation and amortization	235,541	241,814
Europe
Segment Reporting Information [Line Items]
Property and equipment, net of accumulated depreciation and amortization	39,774	41,953
Other
Segment Reporting Information [Line Items]
Property and equipment, net of accumulated depreciation and amortization	$ 6,418	$ 6,131