Annual report pursuant to Section 13 and 15(d)

EMPLOYEE BENEFIT PLANS - Narrative 2 (Details)

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EMPLOYEE BENEFIT PLANS - Narrative 2 (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Minimum [Member] | Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 2019 (in percent) 55.00%    
Minimum [Member] | Debt Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 2019 (in percent) 17.00%    
Minimum [Member] | Cash and Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 2019 (in percent) 0.00%    
Maximum [Member] | Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 2019 (in percent) 81.00%    
Maximum [Member] | Debt Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 2019 (in percent) 37.00%    
Maximum [Member] | Cash and Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Target Allocation 2019 (in percent) 10.00%    
Employee Benefit 401 K Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Matching contributions (in percent) 50.00%    
Participant's compensation for eligible associates (in percent) 6.00%    
Matching contributions $ 0.7 $ 0.6 $ 0.6
Shares reserved for issuance (in shares) 50,000    
Additional Employers Contribution for Associates Hired After Year 2019 as a percentage of compensation 3.00%    
Dividend Reinvestment and Optional Stock Purchase Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Shares reserved for issuance (in shares) 250,000