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EMPLOYEE BENEFIT PLANS - Narrative (Details)
 12 Months Ended
Aug. 01, 2014
USD ($)
Dec. 31, 2019
USD ($)
employee
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jul. 01, 2019
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Expense under the plan   $ 4,100,000 $ 3,900,000 $ 3,400,000  
Split-dollar agreement, accrued liability   $ 7,100,000 4,600,000    
Marketable equity securities          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Target plan asset allocation   65.00%      
Fixed income          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Target plan asset allocation   34.00%      
Cash equivalents          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Target plan asset allocation   1.00%      
Pension Plans          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Number of employees participation (employee) | employee   0      
Net actuarial loss   $ 1,200,000 1,500,000    
Expense under the plan     907,000    
Expected cash contributions by employer   0      
Amount expected to be amortized from other comprehensive income into net periodic pension cost over the next fiscal year   93,000      
Defined benefit plan, fair value of plan assets   $ 5,799,000 $ 5,522,000 5,446,000  
Discount rate (percent)   4.16% 3.51%    
Pension Plans | Fixed income          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Defined benefit plan, fair value of plan assets   $ 1,535,000 $ 1,628,000    
Postretirement Benefits          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Net actuarial loss   374,000 (191,000)    
Amount expected to be amortized from other comprehensive income into net periodic pension cost over the next fiscal year   83,000      
Defined benefit plan, fair value of plan assets   $ 0 $ 0 0  
Prior service cost of long-term care plan participants $ 558,000        
Discount rate (percent)   3.06% 4.11%    
Assumed health care cost trend rate   7.25%      
Ultimate health care cost trend rate   3.84%      
Supplemental Employee Retirement Plan          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Expense under the plan   $ 928,000 $ 638,000 $ 968,000  
Eligible age for retirement plan   62 years      
Accrued expenses   $ 20,300,000 $ 3,400,000    
Supplemental Employee Retirement Plan | Chief Executive Officer          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Accrued expenses   5,400,000      
Multiemployer Plans, Pension          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Expense under the plan   290,000      
Total planned liabilities   $ 4,800,000     $ 7,200,000
Defined benefit plan, fair value of plan assets         $ 4,300,000