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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