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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Net Sales:      
Total net sales $ 695,977 $ 644,812 $ 660,579
Long-term Assets:      
Total long-term assets 153,636 132,343  
Total long-term assets 153,636 132,343  
North America [Member]      
Net Sales:      
Total net sales 428,046 369,032 330,516
Long-term Assets:      
Total long-term assets 73,835 60,099  
South America [Member]      
Net Sales:      
Total net sales 82,589 95,258 139,780
Long-term Assets:      
Total long-term assets 63,497 56,943  
Europe and Other [Member]      
Net Sales:      
Total net sales 185,342 180,522 $ 190,283
Long-term Assets:      
Total long-term assets $ 16,304 $ 15,301