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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Net Sales:      
Total net sales $ 824,444 $ 695,977 $ 644,812
Long-term Assets:      
Total long-term assets 255,668 153,636  
Total long-term assets 255,668 153,636  
North America [Member]      
Net Sales:      
Total net sales 471,770 428,046 369,032
Long-term Assets:      
Total long-term assets 89,997 73,835  
South America [Member]      
Net Sales:      
Total net sales 94,533 82,589 95,258
Long-term Assets:      
Total long-term assets 58,989 63,497  
Europe and Other [Member]      
Net Sales:      
Total net sales 258,141 185,342 $ 180,522
Long-term Assets:      
Total long-term assets $ 106,682 $ 16,304