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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 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]                      
Net sales $ 189,731 $ 175,764 $ 99,545 $ 182,966 $ 190,365 $ 203,386 $ 222,241 $ 218,297 $ 648,006 $ 834,289 $ 866,199
Long-term Assets:                      
Total long-term assets 286,744       270,943       286,744 270,943  
North America [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 330,528 457,633 480,511
Long-term Assets:                      
Total long-term assets 110,330       87,430       110,330 87,430  
South America [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 47,663 67,534 80,175
Long-term Assets:                      
Total long-term assets 33,785       52,518       33,785 52,518  
Europe and Other [Member]                      
Segment Reporting Information [Line Items]                      
Net sales                 269,815 309,122 $ 305,513
Long-term Assets:                      
Total long-term assets $ 142,629       $ 130,995       $ 142,629 $ 130,995