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EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS - Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Pension Plan [Member]    
EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS    
Service cost $ 0 $ 0
Interest cost 23 28
Expected return on plan assets (27) (22)
Prior service cost 0 0
Recognized net actuarial loss (gain) 16 20
Total net periodic benefit cost 12 26
Other Postretirement Benefits Plan [Member]    
EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS    
Service cost 46 33
Interest cost 39 50
Expected return on plan assets 0 0
Prior service cost (31) (31)
Recognized net actuarial loss (gain) (14) (21)
Total net periodic benefit cost $ 40 $ 31