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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Inventories [Abstract]    
Finished goods $ 57,856 $ 51,626
Work-in-process 7,696 6,221
Raw materials and supplies 7,472 7,086
Inventories $ 73,024 $ 64,933