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INVENTORIES | 6 Months Ended
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Jun. 30, 2019
INVENTORIES |
INVENTORIES | 9. INVENTORIES Inventories consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, |  | December 31,
(in thousands) | ​ | 2019 | ​ | 2018
Raw materials and supplies | ​ | $ | 33,940 | ​ | $ | 26,874
Work in process | ​ |  | 8,903 | ​ |  | 10,671
Finished goods | ​ |  | 8,061 | ​ |  | 9,225
Total inventories | ​ | $ | 50,904 | ​ | $ | 46,770
​

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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