Business Segment and Foreign Operations - Long-lived Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Long-Lived Assets [Line Items]
Total long-lived tangible assets	$ 110,247	$ 95,380
United States
Long-Lived Assets [Line Items]
Total long-lived tangible assets	11,948	7,015
People's Republic of China (PRC)
Long-Lived Assets [Line Items]
Total long-lived tangible assets	94,113	83,794
Other
Long-Lived Assets [Line Items]
Total long-lived tangible assets	$ 4,186	$ 4,571