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Segment Reporting (Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net Sales:      
Total net sales $ 644,812 $ 660,579 $ 659,486
Long-term Assets:      
Total long-term assets 132,343 153,240  
North America [Member]      
Net Sales:      
Total net sales 369,032 330,516 301,592
Long-term Assets:      
Total long-term assets 60,099 53,406  
South America [Member]      
Net Sales:      
Total net sales 95,258 139,780 178,532
Long-term Assets:      
Total long-term assets 56,943 85,433  
Europe and Other [Member]      
Net Sales:      
Total net sales 180,522 190,283 $ 179,362
Long-term Assets:      
Total long-term assets $ 15,301 $ 14,401