Annual report pursuant to Section 13 and 15(d)

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
6 Months Ended 12 Months Ended
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 39,879 37,854 34,000  
Service cost 94 41 692 $ 864
Interest cost 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 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