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RETIREMENT BENEFITS - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 USD ($) employee | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Defined Contribution Plan Disclosure [Line Items] |  |  |
Employer matching contributions | $ | $ 3,839 | $ 3,346 | $ 3,029
Number of employees | 3,000 |  |
Entity number of employees, field personnel | 2,200 |  |
Other Postretirement Benefits Plan |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Contributions | $ | $ 18,507 | $ 18,709 | $ 18,847
Union Members |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Number of employees | 500 |  |
Number of employees, percent | 20.00% |  |

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