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Segment Reporting (Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Net Sales:      
Net sales $ 218,297 $ 225,930  
Long-term Assets:      
Total long-term assets 258,847   $ 239,342
North America [Member]      
Net Sales:      
Net sales 119,367 124,429  
Long-term Assets:      
Total long-term assets 92,315   86,763
South America [Member]      
Net Sales:      
Net sales 17,332 20,545  
Long-term Assets:      
Total long-term assets 44,996   45,408
Europe and Other [Member]      
Net Sales:      
Net sales 81,598 $ 80,956  
Long-term Assets:      
Total long-term assets $ 121,536   $ 107,171