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STOCK-BASED COMPENSATION PLANS - Narrative (Details) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise of stock options |  |  | $ 14 | $ 101
Total compensation cost | $ 1,000 | $ 1,400 | 2,000 | 2,800
Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise of stock options | $ 101 | $ 15 | $ 15 | $ 101
Non-Vested Stock Awards Outstanding |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock awards vested (in shares) | 62 | 63 | 127 | 150

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