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REVENUE, Disclosure of Impact of Adoption on Balance Sheet and Consolidated Statement of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Assets [Abstract] |  |  |  |  |
Unbilled receivables | $ 16,553 |  | $ 16,553 |  | $ 0
Inventories | 114,434 |  | 114,434 |  | 107,719
Liabilities [Abstract] |  |  |  |  |
Other current liabilities | 3,836 |  | 3,836 |  | 6,204
Equity [Abstract] |  |  |  |  |
Retained earnings | 165,518 |  | 165,518 |  | 147,807
Statement of Operations [Abstract] |  |  |  |  |
Net sales | 146,489 | $ 126,386 | 405,451 | $ 371,671 |
Cost of sales | 117,282 | 98,686 | 326,096 | 291,481 |
Operating income | 10,499 | 6,794 | 21,603 | 16,415 |
(Benefit from) provision for income taxes | (2,201) | 60 | 523 | 2,329 |
Net earnings | 11,352 | $ 5,024 | 16,684 | $ 8,890 |
ASU 2014-09 [Member] |  |  |  |  |
Assets [Abstract] |  |  |  |  |
Unbilled receivables |  |  |  |  | 14,536
Inventories |  |  |  |  | 96,675
Liabilities [Abstract] |  |  |  |  |
Other current liabilities |  |  |  |  | 6,247
Equity [Abstract] |  |  |  |  |
Retained earnings |  |  |  |  | 151,256
Balances Without Adoption of ASC 606 [Member] | ASU 2014-09 [Member] |  |  |  |  |
Assets [Abstract] |  |  |  |  |
Unbilled receivables | 0 |  | 0 |  |
Inventories | 126,737 |  | 126,737 |  |
Liabilities [Abstract] |  |  |  |  |
Other current liabilities | 3,715 |  | 3,715 |  |
Equity [Abstract] |  |  |  |  |
Retained earnings | 161,389 |  | 161,389 |  |
Statement of Operations [Abstract] |  |  |  |  |
Net sales | 145,523 |  | 403,434 |  |
Cost of sales | 116,312 |  | 324,837 |  |
Operating income | 10,503 |  | 20,845 |  |
(Benefit from) provision for income taxes | (2,163) |  | 445 |  |
Net earnings | 11,318 |  | 16,004 |  |
Effect of Change Higher/(Lower) [Member] | ASU 2014-09 [Member] |  |  |  |  |
Assets [Abstract] |  |  |  |  |
Unbilled receivables | 16,553 |  | 16,553 |  | 14,536
Inventories | (12,303) |  | (12,303) |  | (11,044)
Liabilities [Abstract] |  |  |  |  |
Other current liabilities | 121 |  | 121 |  | 43
Equity [Abstract] |  |  |  |  |
Retained earnings | 4,129 |  | 4,129 |  | $ 3,449
Statement of Operations [Abstract] |  |  |  |  |
Net sales | 966 |  | 2,017 |  |
Cost of sales | 970 |  | 1,259 |  |
Operating income | (4) |  | 758 |  |
(Benefit from) provision for income taxes | (38) |  | 78 |  |
Net earnings | $ 34 |  | $ 680 |  |

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