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REVENUE, Cumulative Effect of Changes made to Consolidated Balance Sheet (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Balance Sheet [Abstract] |  |
Unbilled receivables | $ 16,553 | $ 0
Inventory | 114,434 | 107,719
Other current liabilities | 3,836 | 6,204
Retained earnings | 165,518 | 147,807
ASU 2014-09 [Member] |  |
Balance Sheet [Abstract] |  |
Unbilled receivables |  | 14,536
Inventory |  | 96,675
Other current liabilities |  | 6,247
Retained earnings |  | 151,256
Adjustments Due to ASC 606 [Member] | ASU 2014-09 [Member] |  |
Balance Sheet [Abstract] |  |
Unbilled receivables | 16,553 | 14,536
Inventory | (12,303) | (11,044)
Other current liabilities | 121 | 43
Retained earnings | 4,129 | $ 3,449
Balances Without Adoption of ASC 606 [Member] | ASU 2014-09 [Member] |  |
Balance Sheet [Abstract] |  |
Unbilled receivables | 0 |
Inventory | 126,737 |
Other current liabilities | 3,715 |
Retained earnings | $ 161,389 |

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