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STOCK-BASED COMPENSATION - Compensation expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
STOCK-BASED COMPENSATION |  |  |  |
Pre - tax cost | $ 581 | $ 544 | $ 1,157 | $ 1,082
After tax cost | $ 453 | $ 424 | $ 902 | $ 844

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