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REVENUE, Cumulative Effect of Changes made to Consolidated Balance Sheet (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Balance Sheet [Abstract] |  |
Unbilled receivables | $ 15,587 | $ 0
Inventory | 106,448 | 107,719
Other current liabilities | 5,077 | 6,204
Retained earnings | 154,985 | 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 | 15,587 | 14,536
Inventory | (11,332) | (11,044)
Other current liabilities | 159 | 43
Retained earnings | 4,096 | $ 3,449
Balances Without Adoption of ASC 606 [Member] | ASU 2014-09 [Member] |  |
Balance Sheet [Abstract] |  |
Unbilled receivables | 0 |
Inventory | 117,780 |
Other current liabilities | 4,918 |
Retained earnings | $ 150,889 |

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