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EMPLOYEE BENEFIT PLANS Table 1 - Changes in Benefit Obligation/Fair Value of Plan Assets/Funded Status/Amounts Recognized in Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Pension Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Accumulated benefit obligation for the Pension Plans       $ 164,200 $ 139,700
Change in benefit obligation:          
Benefit obligation, January 1 $ 141,833 $ 149,817      
Service cost 9,549 9,621 $ 8,955    
Interest cost 5,480 4,824 4,507    
Benefits paid (7,109) (7,929)      
Participant contributions 0 0      
Actuarial loss (gain) 17,504 (14,500)      
Benefit obligation, December 31 167,257 141,833 149,817    
Change in plan assets:          
Plan assets at fair value, January 1 126,949 129,878      
Actual return on plan assets 28,064 (6,034)      
Employer contributions 11,132 11,034      
Benefits paid (7,109) (7,929)      
Participant contributions 0 0      
Plan assets at fair value, December 31 159,036 126,949 129,878    
Reconciliation of funded status:          
Fair value of plan assets at December 31 159,036 126,949 129,878 159,036 126,949
Less: Benefit obligation at December 31 167,257 141,833 149,817 167,257 141,833
Funded status at December 31       (8,221) (14,884)
Amounts recognized in the consolidated balance sheets:          
Accrued liabilities       (303) (267)
Other long-term liabilities       (7,918) (14,617)
Net pension liability       (8,221) (14,884)
Other Postretirement Benefit Plans [Member]          
Change in benefit obligation:          
Benefit obligation, January 1 10,908 12,410      
Service cost 431 504 456    
Interest cost 453 429 430    
Benefits paid (217) (255)      
Participant contributions 62 87      
Actuarial loss (gain) 1,559 (2,267)      
Benefit obligation, December 31 13,196 10,908 12,410    
Change in plan assets:          
Plan assets at fair value, January 1 0 0      
Actual return on plan assets 0 0      
Employer contributions 155 168      
Benefits paid (217) (255)      
Participant contributions 62 87      
Plan assets at fair value, December 31 0 0 0    
Reconciliation of funded status:          
Fair value of plan assets at December 31 0 0 0 0 0
Less: Benefit obligation at December 31 $ 13,196 $ 10,908 $ 12,410 13,196 10,908
Funded status at December 31       (13,196) (10,908)
Amounts recognized in the consolidated balance sheets:          
Accrued liabilities       (368) (362)
Other long-term liabilities       (12,828) (10,546)
Net pension liability       $ (13,196) $ (10,908)