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COMMON SHARES - Narrative (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 03, 2022 | May 11, 2022 | Dec. 01, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | May 03, 2023 | May 02, 2023 | Dec. 31, 2020
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Maximum amount of stock to be issued |  | $ 1,200,000 |  |  |  |  |  |  |
Equity offering (in shares) |  |  |  | 0 | 2,165,671 |  |  |  |
Consideration received from sale of stock |  |  |  |  | $ 197,100 |  |  |  |
Treasury stock, common (in shares) |  |  |  | 10,443,807 | 11,540,218 |  |  |  |
Common stock outstanding (in shares) |  |  |  | 349,540,266 | 348,443,855 |  |  |  |
Issuance of treasury shares for acquisition |  |  | $ 38,100 |  | $ 72,133 | $ 38,051 |  |  |
Authorized (in shares) |  |  |  | 410,000,000 | 380,000,000 |  | 410,000,000 | 380,000,000 |
Subsidiaries | The Torrington Water Company (TWC) |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Purchase price | $ 72,100 |  |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock outstanding (in shares) |  |  |  | 349,540,266 | 348,443,855 | 344,403,196 |  |  | 342,954,023
Issuance of treasury shares for acquisition (in shares) | 925,264 |  | 462,517 |  | 925,264 | 462,517 |  |  |

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