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Inventories (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Inventories [Abstract]        
Raw material reserves $ 1,934 $ 2,488    
Products-in-progress reserves 66,122 71,468    
Finished product reserves 12,874 14,218    
Total $ 80,930 $ 88,174 $ 105,282 $ 96,284