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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 | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Assets [Abstract] |  |  |  |  |
Unbilled receivables | $ 15,587 |  | $ 15,587 |  | $ 0
Inventories | 106,448 |  | 106,448 |  | 107,719
Liabilities [Abstract] |  |  |  |  |
Other current liabilities | 5,077 |  | 5,077 |  | 6,204
Equity [Abstract] |  |  |  |  |
Retained earnings | 154,985 |  | 154,985 |  | 147,807
Statement of Operations [Abstract] |  |  |  |  |
Net sales | 140,710 | $ 131,617 | 258,961 | $ 245,285 |
Cost of sales | 111,696 | 102,490 | 208,814 | 192,795 |
Operating income | 10,667 | 7,266 | 11,104 | 9,621 |
Provision for income taxes | 2,399 | 2,292 | 2,724 | 2,269 |
Net earnings | 6,634 | $ 3,120 | 5,332 | $ 3,866 |
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 | 117,780 |  | 117,780 |  |
Liabilities [Abstract] |  |  |  |  |
Other current liabilities | 4,918 |  | 4,918 |  |
Equity [Abstract] |  |  |  |  |
Retained earnings | 150,889 |  | 150,889 |  |
Statement of Operations [Abstract] |  |  |  |  |
Net sales | 138,777 |  | 257,911 |  |
Cost of sales | 110,321 |  | 208,526 |  |
Operating income | 10,109 |  | 10,342 |  |
Provision for income taxes | 2,343 |  | 2,608 |  |
Net earnings | 6,132 |  | 4,686 |  |
Effect of Change Higher/(Lower) [Member] | ASU 2014-09 [Member] |  |  |  |  |
Assets [Abstract] |  |  |  |  |
Unbilled receivables | 15,587 |  | 15,587 |  | 14,536
Inventories | (11,332) |  | (11,332) |  | (11,044)
Liabilities [Abstract] |  |  |  |  |
Other current liabilities | 159 |  | 159 |  | 43
Equity [Abstract] |  |  |  |  |
Retained earnings | 4,096 |  | 4,096 |  | $ 3,449
Statement of Operations [Abstract] |  |  |  |  |
Net sales | 1,933 |  | 1,050 |  |
Cost of sales | 1,375 |  | 288 |  |
Operating income | 558 |  | 762 |  |
Provision for income taxes | 56 |  | 116 |  |
Net earnings | $ 502 |  | $ 646 |  |

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