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EMPLOYEE BENEFIT PLANS - Present Value of Plan Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | $ 716,794 | $ 573,575 | $ 469,774
Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 147,057 | 128,554 | $ 102,625
Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 716,794 | 573,575 |
Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 147,057 | 128,554 |
Level 1 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 405,735 | 318,988 |
Level 1 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 147,057 | 128,554 |
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 | 311,059 | 254,587 |
Assets measured at net asset value (NAV) | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
Fixed Income | Level 1, 2, and 3 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 108,695 | 91,231 |
Fixed Income | Level 1, 2, and 3 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 54,731 | 50,277 |
Fixed Income | Level 1 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 108,695 | 91,231 |
Fixed Income | Level 1 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 54,731 | 50,277 |
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 | 57,201 | 43,238 |
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 | 0 | 0 |
Domestic Equity: Small/Mid Cap Stocks | Level 1 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 57,201 | 43,238 |
Domestic Equity: Small/Mid Cap Stocks | Level 1 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
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 | 195,497 | 155,645 |
Domestic Equity: Large Cap Stocks | Level 1, 2, and 3 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 92,326 | 78,277 |
Domestic Equity: Large Cap Stocks | Level 1 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 195,497 | 155,645 |
Domestic Equity: Large Cap Stocks | Level 1 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 92,326 | 78,277 |
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 | 44,342 | 28,874 |
Non U.S. Equities | Level 1, 2, and 3 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 |  |
Non U.S. Equities | Level 1 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 44,342 | 28,874 |
Non U.S. Equities | Level 1 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | 0 | 0 |
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 |

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