Post-effective amendment to a registration statement that is not immediately effective upon filing

PENSION AND OTHER RETIREMENTS BENEFITS - Funded Status of Company's Defined Benefit Pension Plans (Details)

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PENSION AND OTHER RETIREMENTS BENEFITS - Funded Status of Company's Defined Benefit Pension Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Jun. 25, 2020
Dec. 31, 2019
Dec. 31, 2018
Change in plans’ assets:            
Employee contributions     $ 163 $ 163 $ 320  
Net pension liability     (8,054) (9,205) (7,641)  
Pension Plan            
Defined Benefit Plan Disclosure            
Accumulated benefit obligations     41,112 39,792 37,847  
Changes in projected benefit obligations:            
Projected benefit obligations at beginning of year $ 41,112 $ 37,854 39,879 37,854 34,000  
Service cost 16 14 94 41 692 $ 864
Interest cost 259 51 545 593 1,410 1,320
Actuarial loss     1,568 1,826 5,236  
Benefits paid     (974) (435) (1,019)  
Liability gain due to curtailment     0 0 (2,465)  
Projected benefit obligations at end of year     41,112 39,879 37,854 34,000
Change in plans’ assets:            
Fair value of plans’ assets at beginning of year $ 33,058 $ 30,213 30,674 30,213 25,800  
Actual returns on plans’ assets     3,195 732 5,112  
Benefits paid     (974) (434) (1,019)  
Fair value of plans’ assets at end of year     $ 33,058 $ 30,674 $ 30,213 $ 25,800