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EMPLOYEE BENEFIT PLANS Defined Benefit Plan, Fair Value on Plan Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value measurements $ 155,704 $ 141,816 $ 130,078
Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value measurements 151,511 136,459  
Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value measurements 4,193 5,357  
Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value measurements 0 0  
Fair Value, Inputs, Level 1, 2 and 3 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value measurements 155,704 141,816  
Cash | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value measurements 129 195  
Cash | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value measurements 0 0  
Cash | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value measurements 0 0  
Cash | Fair Value, Inputs, Level 1, 2 and 3 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value measurements 129 195  
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value measurements 0 0  
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value measurements 4,193 5,357  
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value measurements 0 0  
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value measurements 4,193 5,357  
Fixed income mutual funds | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value measurements 65,443 75,720  
Fixed income mutual funds | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value measurements 0 0  
Fixed income mutual funds | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value measurements 0 0  
Fixed income mutual funds | Fair Value, Inputs, Level 1, 2 and 3 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value measurements 65,443 75,720  
Equity mutual funds | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value measurements 85,939 60,544  
Equity mutual funds | Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value measurements 0 0  
Equity mutual funds | Fair Value, Inputs, Level 3 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value measurements 0 0  
Equity mutual funds | Fair Value, Inputs, Level 1, 2 and 3 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value measurements $ 85,939 $ 60,544