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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]        
Pension Cost (Reversal of Cost) $ 1,041 $ 859 $ (628)  
Payment for Pension Benefits 0 0 0  
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year $ 0      
Defined Contribution Plan, Maximum Annual Contribution Percent by Employee 50.00%      
Defined Contribution Plan, Cost $ 0 0 1,900  
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Benefit obligation at beginning of year 68,286 71,154    
Service cost 6,591 6,501 4,894  
Interest cost 2,778 2,394 2,325  
Actuarial gain (loss) 6,848 (4,032)    
Defined Benefit Plan, Benefit Obligation, Benefits Paid 9,459 7,731    
Benefit obligation at end of year 75,044 68,286 71,154  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets at beginning of year 130,078 144,349    
Actual return on plan assets 21,197 (6,540)    
Defined Benefit Plan, Plan Assets, Benefits Paid 9,459 7,731    
Fair value of plan assets at end of year 141,816 130,078 144,349  
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]        
Assets 66,772 61,792    
Liabilities 0 0    
Net amount recognized 66,772 61,792    
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Abstract]        
Net actuarial loss 37,278 43,711    
Net prior service cost (1,095) (1,508)    
Deferred tax assets (8,242) (9,613)    
Net amount recognized 27,941 32,590 19,631 $ 22,803
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax (4,649) 8,180 (3,172)  
Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment and Disproportionate Tax Effect Net Of Tax   12,959    
Accumulated benefit obligation 74,424 66,320    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 6,591 6,501 4,894  
Interest cost 2,778 2,394 2,325  
Expected return on plan assets (9,718) (9,811) (9,358)  
Amortization of prior service cost (413) (413) (413)  
Defined Benefit Plan, Amortization of Gain (Loss) 1,803 2,188 1,924  
Net periodic benefit (income) cost 1,041 859 (628)  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract]        
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax (4,630) 12,319 (2,775)  
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax 0 0 0  
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Prior Service Cost, before Tax 413 413 413  
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax (1,803) (2,188) (1,924)  
Total recognized in accumulated other comprehensive income (6,020) 10,544 (4,286)  
Total recognized in net periodic benefit cost and accumulated other comprehensive income (4,979) 11,403 (4,914)  
Amortization of loss 2,079 1,867 2,090  
Amortization of prior service credit $ (413) $ (413) $ (413)  
Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]        
Discount rate 3.33% 4.31% 3.43%  
Rate of compensation increase 3.50% 3.50% 3.50%  
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Discount rate 4.31% 3.43% 3.88%  
Expected return on plan assets 7.25% 7.25% 7.25%  
Rate of compensation increase 3.50% 3.50% 3.50%  
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]        
2020 $ 5,611      
2021 5,210      
2022 5,173      
2023 5,125      
2024 6,070      
Thereafter $ 35,362