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Sales (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Revenue, Major Customer [Line Items]        
Sales $ 25,402 $ 27,603 $ 55,629 $ 57,125
Customer A [Member]        
Revenue, Major Customer [Line Items]        
Sales     8,956 10,538
Customer B [Member]        
Revenue, Major Customer [Line Items]        
Sales     7,327 [1]
Customer C [Member]        
Revenue, Major Customer [Line Items]        
Sales     [1] $ 7,515
[1] Less than 10% of sales.