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Segment Information (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
segment
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]      
Number of operating segments | segment 1    
Net sales $ 1,337,991 $ 1,280,986 $ 1,344,777
Long-lived assets 436,655 442,944  
Netherlands      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 12,400 11,300 $ 13,700
Long-lived assets $ 1,400 $ 300