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EMPLOYEE BENEFIT PLANS Defined Benefit Plan, Fair Value on Plan Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value measurements $ 141,816 $ 130,078 $ 144,349
Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value measurements 136,459 122,025  
Fair Value, Inputs, Level 2 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value measurements 5,357 8,053  
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 141,816 130,078  
Cash | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value measurements 195 216  
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 195 216  
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 5,357 8,053  
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 5,357 8,053  
Fixed income mutual funds | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value measurements 75,720 74,453  
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 75,720 74,453  
Equity mutual funds | Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Fair value measurements 60,544 47,356  
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 $ 60,544 $ 47,356