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Segments and Geographic Areas (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales $ 591,300 $ 521,100 $ 468,500
North America [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 176,900 149,000 125,700
European Union [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 214,800 194,700 170,600
Middle East [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 50,500 41,600 41,900
Asia [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 88,000 81,300 78,200
Segment Geographical Groups Of Countries Group Six [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 9,900 10,500 11,000
Central and South America [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales $ 51,200 $ 44,000 $ 41,100