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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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Net Sales:          
Total net sales $ 203,582 $ 173,846 $ 617,004 $ 523,365  
Long-term Assets:          
Total long-term assets 243,096   243,096   $ 153,636
Continuing Operations [Member]          
Net Sales:          
Total net sales 203,582 173,846 617,004 523,365  
Long-term Assets:          
Total long-term assets 243,096   243,096   153,636
Continuing Operations [Member] | North America [Member]          
Net Sales:          
Total net sales 113,402 108,605 358,275 321,973  
Long-term Assets:          
Total long-term assets 76,539   76,539   73,835
Continuing Operations [Member] | South America [Member]          
Net Sales:          
Total net sales 25,386 22,342 70,519 60,207  
Long-term Assets:          
Total long-term assets 62,500   62,500   63,497
Continuing Operations [Member] | Europe and Other [Member]          
Net Sales:          
Total net sales 64,794 $ 42,899 188,210 $ 141,185  
Long-term Assets:          
Total long-term assets $ 104,057   $ 104,057   $ 16,304