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EMPLOYEE BENEFIT PLANS - Present Value of Plan Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | $ 810,469 | $ 716,794 | $ 573,575
Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets | $ 169,436 | 147,057 | 128,554
Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets |  | 810,469 | 716,794
Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets |  | 169,436 | 147,057
Level 1 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets |  | 443,620 | 405,735
Level 1 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets |  | 169,436 | 147,057
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 |  | 366,849 | 311,059
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 |  | 126,062 | 108,695
Fixed Income | Level 1, 2, and 3 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets |  | 63,713 | 54,731
Fixed Income | Level 1 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets |  | 126,062 | 108,695
Fixed Income | Level 1 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets |  | 63,713 | 54,731
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 |  | 63,379 | 57,201
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 |  | 63,379 | 57,201
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 |  | 218,868 | 195,497
Domestic Equity: Large Cap Stocks | Level 1, 2, and 3 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets |  | 105,723 | 92,326
Domestic Equity: Large Cap Stocks | Level 1 | Fair Value, Recurring | Pension Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets |  | 218,868 | 195,497
Domestic Equity: Large Cap Stocks | Level 1 | Fair Value, Recurring | Other Benefits |  |  |
Employee benefit plans |  |  |
Fair value of pension plan assets |  | 105,723 | 92,326
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 |  | 35,311 | 44,342
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 |  | 35,311 | 44,342
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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