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Business Segment and Foreign Operations - Long-lived Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Long-Lived Assets [Line Items]    
Long-lived tangible assets $ 95,380 $ 81,606
United States [Member]    
Long-Lived Assets [Line Items]    
Long-lived tangible assets 7,015 5,716
People's Republic of China [Member]    
Long-Lived Assets [Line Items]    
Long-lived tangible assets 83,794 70,619
All Other Countries [Member]    
Long-Lived Assets [Line Items]    
Long-lived tangible assets $ 4,571 $ 5,271