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DISPOSED AND DISCONTINUED OPERATIONS (Tables) | 12 Months Ended
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Dec. 31, 2020
DISPOSED AND DISCONTINUED OPERATIONS |
Schedule of disposal groups, including discontinued operations | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2020 |  | 2019
Sales | ​ | $ | — | ​ | $ | —
Cost of sales | ​ |  | — | ​ |  | (901)
Total operating expense | ​ |  | 620 | ​ |  | 1,022
Operating income (loss) from discontinued operations | ​ |  | (620) | ​ |  | (121)
Other income (expense) | ​ |  | 65 | ​ |  | 10,895
Income (loss) from discontinued operations before income taxes | ​ |  | (555) | ​ |  | 10,774
Provision (benefit) for income taxes | ​ |  | (134) | ​ |  | 2,294
Income (loss) from discontinued operations, net of income taxes | ​ | $ | (421) | ​ | $ | 8,480

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