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Segments and Geographic Areas (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenues from External Customers [Line Items]      
Net sales $ 468,540 $ 499,261 $ 563,579
North America [Member]      
Revenues from External Customers [Line Items]      
Net sales 125,700 125,900 145,900
Europe [Member]      
Revenues from External Customers [Line Items]      
Net sales 170,600 177,900 215,700
Central and South America [Member]      
Revenues from External Customers [Line Items]      
Net sales 41,100 57,700 50,600
Middle East [Member]      
Revenues from External Customers [Line Items]      
Net sales 41,900 40,300 43,300
Asia [Member]      
Revenues from External Customers [Line Items]      
Net sales 78,200 85,600 98,700
Other [Member]      
Revenues from External Customers [Line Items]      
Net sales $ 11,000 $ 11,900 $ 9,400