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COMMITMENTS AND CONTINGENCIES - Tax Credit Program and Worker's Compensation Reserves (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Jul. 20, 2011
New Markets Tax Credit program |  |  |  |
Extinguishment gain |  | $ 2,249 |  |
Workers' Compensation Reserves |  |  |  |
Amount accrued for self-insured workers' compensation claims |  | 374 | $ 812 |
New Markets Tax Credit Transaction |  |  |  |
New Markets Tax Credit program |  |  |  |
Future tax credit that can be generated | $ 3,900 | $ 3,900 |  |
Tax credit period |  | 7 years |  |
Period which facility must operate and be in compliance | 7 years | 7 years |  |
Obligation under Put Option | $ 130 | $ 130 |  |
Extinguishment gain | $ 2,249 |  |  |
New Markets Tax Credit Transaction | Broadwind Services, LLC |  |  |  |
New Markets Tax Credit program |  |  |  |
Gross loan from AMCREF to Broadwind Services |  |  |  | $ 10,000

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