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Inventories | 3 Months Ended
--- | ---
Mar. 31, 2018
Inventory Disclosure [Abstract] |
Inventories | Inventories Inventories are comprised of the following:
| As of March 31, 2018 |  | As of December 31, 2017
| (Dollars in thousands)
Inventories: |  |  |
Raw materials | $ | 49,392 |  |  | $ | 39,434 |
Work in process | 93,578 |  |  | 85,852 |
Finished goods | 59,548 |  |  | 48,865 |
Total | $ | 202,518 |  |  | $ | 174,151 |
We recorded a lower of cost or market inventory adjustment of $1.3 million in the three months ended March 31, 2017. There was no lower of cost or market inventory adjustment for the three months ended March 31, 2018 as a result of increased sales prices and lower costs.

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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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