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EMPLOYEE BENEFIT PLANS - Present Value of Plan Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | $ 716,273 | $ 637,330 | $ 810,469
Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 163,367 | 144,686 | $ 169,436
Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 716,273 | 637,330 |
Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 163,367 | 144,686 |
Level 1 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 407 | 588 |
Level 1 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 38,686 | 33,669 |
Level 2 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Level 2 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Level 3 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Level 3 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Assets measured at net asset value (NAV) | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 715,866 | 636,742 |
Assets measured at net asset value (NAV) | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 124,681 | 111,017 |
Fixed Income | Level 1, 2, and 3 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 407 | 588 |
Fixed Income | Level 1, 2, and 3 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 21,891 | 18,060 |
Fixed Income | Level 1 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 407 | 588 |
Fixed Income | Level 1 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 21,891 | 18,060 |
Fixed Income | Level 2 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Fixed Income | Level 2 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Fixed Income | Level 3 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Fixed Income | Level 3 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Domestic Equity: Small/Mid Cap Stocks | Level 1, 2, and 3 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Domestic Equity: Small/Mid Cap Stocks | Level 1, 2, and 3 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 6,437 | 5,654 |
Domestic Equity: Small/Mid Cap Stocks | Level 1 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Domestic Equity: Small/Mid Cap Stocks | Level 1 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 6,437 | 5,654 |
Domestic Equity: Small/Mid Cap Stocks | Level 2 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Domestic Equity: Small/Mid Cap Stocks | Level 2 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Domestic Equity: Small/Mid Cap Stocks | Level 3 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Domestic Equity: Small/Mid Cap Stocks | Level 3 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Domestic Equity: Large Cap Stocks | Level 1, 2, and 3 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Domestic Equity: Large Cap Stocks | Level 1, 2, and 3 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Domestic Equity: Large Cap Stocks | Level 1 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Domestic Equity: Large Cap Stocks | Level 1 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Domestic Equity: Large Cap Stocks | Level 2 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Domestic Equity: Large Cap Stocks | Level 2 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Domestic Equity: Large Cap Stocks | Level 3 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Domestic Equity: Large Cap Stocks | Level 3 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Non U.S. Equities | Level 1, 2, and 3 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Non U.S. Equities | Level 1, 2, and 3 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 7,268 | 6,928 |
Non U.S. Equities | Level 1 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Non U.S. Equities | Level 1 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 7,268 | 6,928 |
Non U.S. Equities | Level 2 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Non U.S. Equities | Level 2 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Non U.S. Equities | Level 3 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Non U.S. Equities | Level 3 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Emerging markets | Level 1, 2, and 3 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Emerging markets | Level 1, 2, and 3 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 3,090 | 3,027 |
Emerging markets | Level 1 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Emerging markets | Level 1 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 3,090 | 3,027 |
Emerging markets | Level 2 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Emerging markets | Level 2 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Emerging markets | Level 3 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Emerging markets | Level 3 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | $ 0 | $ 0 |

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