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SEGMENT REPORTING (Summary of the Company's Segment Net Sales, Gross Profit and Segment Margin) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SEGMENT REPORTING |  |  |
Net Sales by Segment | $ 115,944 | $ 98,292 | $ 86,512
Net Sales by Segment (as a percent) | 100.00% | 100.00% | 100.00%
Gross profit (loss) by Segment | $ 32,268 | $ 33,146 | $ 28,356
Gross profit (loss) by Segment (as a percent) | 28.00% | 34.00% | 33.00%
Income before income taxes | $ 4,442 | $ 8,244 | $ 920
Operating segments |  |  |
SEGMENT REPORTING |  |  |
Total Segment Margin | 20,068 | 23,346 | 20,103
Operating segments | Equipment |  |  |
SEGMENT REPORTING |  |  |
Net Sales by Segment | $ 97,680 | $ 77,283 | $ 61,735
Net Sales by Segment (as a percent) | 84.00% | 79.00% | 71.00%
Gross profit (loss) by Segment | $ 25,598 | $ 26,647 | $ 20,263
Gross profit (loss) by Segment (as a percent) | 26.00% | 34.00% | 33.00%
Total Segment Margin | $ 13,398 | $ 16,847 | $ 12,010
Operating segments | Services |  |  |
SEGMENT REPORTING |  |  |
Net Sales by Segment | $ 18,264 | $ 21,009 | $ 24,777
Net Sales by Segment (as a percent) | 16.00% | 21.00% | 29.00%
Gross profit (loss) by Segment | $ 6,670 | $ 6,499 | $ 8,093
Gross profit (loss) by Segment (as a percent) | 37.00% | 31.00% | 33.00%
Total Segment Margin | $ 6,670 | $ 6,499 | $ 8,093
General and Corporate |  |  |
SEGMENT REPORTING |  |  |
General and Corporate | $ (15,626) | $ (15,102) | $ (19,183)

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