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ACCRUED EXPENSES (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
ACCRUED EXPENSES [Abstract] |  |
Sales commissions | $ 2,628 | $ 2,609
Subcontracting labor | 1,276 | 1,550
Salaries, bonuses and related benefits | 14,918 | 18,275
Warranty accrual | 1,329 | 1,078
Other | 9,941 | 8,778
Accrued expenses | 30,092 | $ 32,290
Activity and liability balances related to restructuring costs [Roll Forward] |  |
Liability, beginning balance | 0 |
New charges | 1,120 |
Cash payment and other settlements | (351) |
Liability, ending balance | 769 |
Severance Costs [Member] |  |
Activity and liability balances related to restructuring costs [Roll Forward] |  |
Liability, beginning balance | 0 |
New charges | 311 |
Cash payment and other settlements | (244) |
Liability, ending balance | 67 |
Other Restructuring Costs [Member] |  |
Activity and liability balances related to restructuring costs [Roll Forward] |  |
Liability, beginning balance | 0 |
New charges | 809 |
Cash payment and other settlements | (107) |
Liability, ending balance | 702 |
Facility Closing [Member] |  |
Activity and liability balances related to restructuring costs [Roll Forward] |  |
New charges | $ 900 |

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