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STOCK BASED COMPENSATION PLANS - Exercise Prices (Details) - $ / shares | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of Options | 180,020 | 110,660
Weighted Average Exercise Price | $ 35.39 | $ 35.71
$35.11 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of Options | 69,360 |
Weighted Average Exercise Price | $ 34.87 |
35.77 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of Options | 63,267 |
Weighted Average Exercise Price | $ 35.35 |
36.19 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of Options | 47,393 |
Weighted Average Exercise Price | $ 36.19 |

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