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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Net Sales:          
Total net sales     $ 328,114 $ 323,430  
Long-term Assets:          
Total long-term assets $ 145,141   145,141   $ 153,240
Continuing Operations [Member]          
Net Sales:          
Total net sales 165,289 $ 162,099 328,114 323,430  
Long-term Assets:          
Total long-term assets 145,141   145,141   153,240
Continuing Operations [Member] | North America [Member]          
Net Sales:          
Total net sales 94,679 79,718 184,432 159,516  
Long-term Assets:          
Total long-term assets 57,227   57,227   53,406
Continuing Operations [Member] | South America [Member]          
Net Sales:          
Total net sales 22,996 32,920 49,518 66,836  
Long-term Assets:          
Total long-term assets 73,440   73,440   85,433
Continuing Operations [Member] | Europe and Other [Member]          
Net Sales:          
Total net sales 47,614 $ 49,461 94,164 $ 97,078  
Long-term Assets:          
Total long-term assets $ 14,474   $ 14,474   $ 14,401