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Inventories | 9 Months Ended
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Sep. 30, 2017
Inventory Disclosure [Abstract] |
Inventories | Inventories Inventories are comprised of the following:
| As of December 31, 2016 |  | As of September 30, 2017
| (Dollars in thousands)
Inventories: |  |  |
Raw materials and supplies | $ | 54,469 |  |  | $ | 55,492 |
Work in process | 52,379 |  |  | 65,349 |
Finished goods | 49,263 |  |  | 43,727 |
Total | $ | 156,111 |  |  | $ | 164,568 |
We recorded lower of cost or market inventory adjustments of $19.5 million and $1.8 million in the nine months ended September 30, 2016 and September 30, 2017, respectively. The decrease is attributable to the reduction in product costs and increases in prices.

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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