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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
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
SEGMENT REPORTING |  |  |
Net Sales by Segment | $ 98,292 | $ 86,512 | $ 117,103
Net Sales by Segment (as a percent) | 100.00% | 100.00% | 100.00%
Gross profit (loss) by Segment | $ 33,146 | $ 28,356 | $ 27,868
Gross profit (loss) by Segment (as a percent) | 34.00% | 33.00% | 24.00%
Income (loss) before income taxes | $ 8,244 | $ 920 | $ (31,320)
Operating segments |  |  |
SEGMENT REPORTING |  |  |
Total Segment Margin | 23,346 | 20,103 | 18,496
Operating segments | Equipment |  |  |
SEGMENT REPORTING |  |  |
Net Sales by Segment | $ 77,283 | $ 61,735 | $ 87,361
Net Sales by Segment (as a percent) | 79.00% | 71.00% | 75.00%
Gross profit (loss) by Segment | $ 26,647 | $ 20,263 | $ 21,470
Gross profit (loss) by Segment (as a percent) | 34.00% | 33.00% | 25.00%
Total Segment Margin | $ 16,847 | $ 12,010 | $ 12,097
Operating segments | Services |  |  |
SEGMENT REPORTING |  |  |
Net Sales by Segment | $ 21,009 | $ 24,777 | $ 29,742
Net Sales by Segment (as a percent) | 21.00% | 29.00% | 25.00%
Gross profit (loss) by Segment | $ 6,499 | $ 8,093 | $ 6,398
Gross profit (loss) by Segment (as a percent) | 31.00% | 33.00% | 22.00%
Total Segment Margin | $ 6,499 | $ 8,093 | $ 6,399
General and Corporate |  |  |
SEGMENT REPORTING |  |  |
General and Corporate | $ (15,102) | $ (19,183) | $ (49,816)

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