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EARNINGS PER SHARE - Schedule of computation of earnings per common share (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Net income per share calculations for basic and diluted methods |  |  |
Net income | $ 122,565 | $ 128,311 | $ 123,449
Shares: |  |  |
Weighted average number of common shares outstanding, basic (in shares) | 55,432,322 | 55,387,073 | 55,369,476
Weighted average number of common shares outstanding, diluted (in shares) | 56,256,148 | 56,137,164 | 56,008,805
Basic earnings per common share (in dollars per share) | $ 2.21 | $ 2.32 | $ 2.23
Diluted earnings per common share (in dollars per share) | $ 2.18 | $ 2.29 | $ 2.20
Options |  |  |
Shares: |  |  |
Dilutive effect of common stock equivalents (in shares) | 0 | 1,632 | 1,639
Warrants |  |  |
Shares: |  |  |
Dilutive effect of common stock equivalents (in shares) | 324 | 1,753 | 1,753
RSU awards |  |  |
Shares: |  |  |
Dilutive effect of common stock equivalents (in shares) | 647,217 | 665,998 | 615,759
PSU awards |  |  |
Shares: |  |  |
Dilutive effect of common stock equivalents (in shares) | 151,190 | 58,206 | 5,429
DSU awards |  |  |
Shares: |  |  |
Dilutive effect of common stock equivalents (in shares) | 18,154 | 15,532 | 10,641
2021 ESPP |  |  |
Shares: |  |  |
Dilutive effect of common stock equivalents (in shares) | 6,941 | 6,970 | 4,108

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