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Inventories | 3 Months Ended
--- | ---
Mar. 31, 2017
Inventory Disclosure [Abstract] |
Inventories |
5. | Inventories
(Table only in thousands) |  | March 31, 2017 |  |  | December 31, 2016 |
Raw materials |  | $ | 17,866 |  |  | $ | 17,889 |
Work in process |  |  | 4,142 |  |  |  | 3,986 |
Finished goods |  |  | 1,554 |  |  |  | 1,508 |
Obsolescence allowance |  |  | (2,064 | ) |  |  | (1,896 | )
|  | $ | 21,498 |  |  | $ | 21,487 |
Amounts credited to the allowance for obsolete inventory and charged to cost of sales amounted to $0.2 million and $0.2 million for the three-month periods ended March 31, 2017 and 2016, respectively.

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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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 + Details
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