Annual report pursuant to Section 13 and 15(d)

PENSION AND OTHER RETIREMENTS BENEFITS - Narrative (Details)

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PENSION AND OTHER RETIREMENTS BENEFITS - Narrative (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Dec. 31, 2020
Jun. 25, 2020
Dec. 31, 2019
Dec. 31, 2018
Jun. 26, 2020
Defined Benefit Plan Disclosure          
Net pension asset (liability) $ (8,054) $ (9,205) $ (7,641)    
Defined contribution plan, cost 200 300 300 $ 300  
Nonqualified Plan          
Defined Benefit Plan Disclosure          
Pension benefit obligation 10,300 9,700 9,000    
Pension Plan          
Defined Benefit Plan Disclosure          
Pension benefit obligation 41,112 39,879 37,854 34,000 $ 39,879
Total pension plan assets measured at fair value 33,058 30,674 30,213 25,800  
Net periodic benefit cost (169) 126 2,438 2,170  
Pension Plan | Foreign Plan          
Defined Benefit Plan Disclosure          
Net pension asset (liability) (3,300)   (2,800)    
Pension benefit obligation 6,300   5,600    
Total pension plan assets measured at fair value 3,000   2,800    
Net periodic benefit cost $ 200 $ 300 $ 300 $ 500