Business Segment and Foreign Operations - Long-lived Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Long-lived Assets from External Customers and Long-Lived Assets [Line Items]
Total long-lived tangible assets	$ 103,300	$ 95,380
United States [Member]
Long-lived Assets from External Customers and Long-Lived Assets [Line Items]
Total long-lived tangible assets	8,951	7,015
People's Republic of China [Member]
Long-lived Assets from External Customers and Long-Lived Assets [Line Items]
Total long-lived tangible assets	89,353	83,794
All Other Countries [Member]
Long-lived Assets from External Customers and Long-Lived Assets [Line Items]
Total long-lived tangible assets	$ 4,996	$ 4,571