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