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INCENTIVE STOCK PLANS - Performance Shares (Details) - Performance Shares - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common shares reserved for performance shares granted during year (in shares) | 320,640 | 285,863 | 193,333
Weighted average fair value of performance share units granted (in dollars per share) | $ 34.51 | $ 37.77 | $ 45.68
Intrinsic value of outstanding performance share units | $ 11,463 | $ 12,730 | $ 13,123
Fair value of performance shares vested | 6,388 | 5,863 | 5,549
Cash used to purchase common shares from current and former employees to pay withholding tax requirements on restricted shares vested | $ 1,975 | $ 2,342 | $ 2,454

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