Segment and Geographic Information (Schedule of Property and Equipment by Country) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	$ 43,236	$ 49,481
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	31,641	30,532
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	5,311	10,617
Philippines
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	4,204	4,928
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	1,285	2,310
India
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	0	215
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	397	637
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	398	242
Foreign countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment, net	$ 11,595	$ 18,949