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Inventories (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Inventories [Abstract]        
Raw material reserves $ 2,488 $ 1,838    
Products-in-progress reserves 71,468 82,673    
Finished product reserves 14,218 20,771    
Total $ 88,174 $ 105,282 $ 96,284 $ 81,295