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PENSION AND OTHER RETIREMENT BENEFITS (Tables)
6 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Expense Related to Post-Retirement Plans
The components of net periodic benefit expense related to the Retirement Plans are as follows:
Three Months Ended June 30,
Pension Plans
Other Retirement Plans
2020201920202019
Components of net periodic expense
Service cost$ $ $ $ 
Interest cost
  —  —  
Expected return on plan assets
(5) (5) —  —  
Amortization of net actuarial loss from earlier periods
  —  —  
Net periodic expense
$ $ $ $ 

Six Months Ended June 30,
Pension Plans
Other Retirement Plans
2020201920202019
Components of net periodic expense
Service cost$ $ $ $ 
Interest cost
 10  —   
Expected return on plan assets
(10) (10) —  —  
Amortization of net actuarial loss from earlier periods
  —  —  
Net periodic expense
$10  $10  $ $