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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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Net Sales:          
Total net sales $ 186,903 $ 165,289 $ 349,519 $ 328,114  
Long-term Assets:          
Total long-term assets 143,417   143,417   $ 132,343
Continuing Operations [Member]          
Net Sales:          
Total net sales 186,903 165,289 349,519 328,114  
Long-term Assets:          
Total long-term assets 143,417   143,417   132,343
Continuing Operations [Member] | North America [Member]          
Net Sales:          
Total net sales 114,250 94,679 213,369 184,432  
Long-term Assets:          
Total long-term assets 61,161   61,161   60,099
Continuing Operations [Member] | South America [Member]          
Net Sales:          
Total net sales 20,253 22,996 37,865 49,518  
Long-term Assets:          
Total long-term assets 66,061   66,061   56,943
Continuing Operations [Member] | Europe and Other [Member]          
Net Sales:          
Total net sales 52,400 $ 47,614 98,285 $ 94,164  
Long-term Assets:          
Total long-term assets $ 16,195   $ 16,195   $ 15,301