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EMPLOYEE BENEFIT PLANS - Segregation of assets by the level of valuations inputs (Details) - Defined Benefit Pension Items [Member] - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Plan Assets, Amount $ 44,831 $ 38,478 $ 37,100
Cash and Cash Equivalents [Member] | Level 1 [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Plan Assets, Amount 186 18,939  
Domestic equities [Member] | Level 1 [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Plan Assets, Amount 3,782 2,841  
International equities | Level 1 [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Plan Assets, Amount 620 0  
Mutual funds/ETFs | Level 1 [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Plan Assets, Amount 36,469 15,808  
Corporate bonds | Level 2 [Member]      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Defined Benefit Plan, Plan Assets, Amount $ 3,774 $ 890