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Business Segment and Foreign Operations - Foreign Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Schedule of Revenues from Geographical Segments [Line Items]        
Total net sales $ 177,580 $ 170,986 $ 338,986 $ 321,644
United States        
Schedule of Revenues from Geographical Segments [Line Items]        
Total net sales 85,569 90,872 167,497 174,810
Asia (excluding the PRC)        
Schedule of Revenues from Geographical Segments [Line Items]        
Total net sales 26,916 20,618 51,566 42,191
People's Republic of China (PRC)        
Schedule of Revenues from Geographical Segments [Line Items]        
Total net sales 21,835 23,153 37,578 40,079
Europe        
Schedule of Revenues from Geographical Segments [Line Items]        
Total net sales 19,740 18,544 37,164 34,327
Latin America        
Schedule of Revenues from Geographical Segments [Line Items]        
Total net sales 15,381 11,686 31,026 19,241
Other        
Schedule of Revenues from Geographical Segments [Line Items]        
Total net sales $ 8,139 $ 6,113 $ 14,155 $ 10,996