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Segments and Geographic Areas (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenues from External Customers [Line Items]      
Net sales $ 521,072 $ 468,540 $ 499,261
North America [Member]      
Revenues from External Customers [Line Items]      
Net sales 149,600 125,700 125,900
Europe [Member]      
Revenues from External Customers [Line Items]      
Net sales 192,800 170,600 177,900
Central and South America [Member]      
Revenues from External Customers [Line Items]      
Net sales 43,900 41,100 57,700
Middle East [Member]      
Revenues from External Customers [Line Items]      
Net sales 42,200 41,900 40,300
Asia [Member]      
Revenues from External Customers [Line Items]      
Net sales 81,600 78,200 85,600
Other [Member]      
Revenues from External Customers [Line Items]      
Net sales $ 11,000 $ 11,000 $ 11,900