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Inventories | 3 Months Ended
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Mar. 31, 2018
Inventory Disclosure [Abstract] |
Inventories | Inventories Inventories are valued at the lower of cost or market. Cost is determined by the first-in, first-out (“FIFO”) method. We establish an allowance for excess and obsolete inventories based on product line changes, the feasibility of substituting parts and the need for supply and replacement parts.
| March 31, 2018 |  | December 31, 2017
| (in thousands)
Raw materials | $ | 61,214 |  |  | $ | 57,784 |
Work in process | 3,284 |  |  | 5,957 |
Finished goods | 5,391 |  |  | 8,163 |
| 69,889 |  |  | 71,904 |
Less: Allowance for excess and obsolete inventories | (1,209 | ) |  | (1,118 | )
Total, net | $ | 68,680 |  |  | $ | 70,786 |
The related changes in the allowance for excess and obsolete inventories account are as follows:
| Three months ended
| March 31, 2018 |  | March 31, 2017
Allowance for excess and obsolete inventories: | (in thousands)
Balance, beginning of period | $ | 1,118 |  |  | $ | 1,382 |
Provisions for excess and obsolete inventories | 101 |  |  | 60 |
Inventories written off | (10 | ) |  | — |
Balance, end of period | $ | 1,209 |  |  | $ | 1,442 |

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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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