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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