Annual report pursuant to Section 13 and 15(d)

PENSION AND OTHER RETIREMENTS BENEFITS - Fair Value of Plan Assets (Details)

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PENSION AND OTHER RETIREMENTS BENEFITS - Fair Value of Plan Assets (Details) - Pension Plan - USD ($)
$ in Thousands
Dec. 31, 2020
Jun. 25, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure        
Total pension plan assets measured at fair value $ 33,058 $ 30,674 $ 30,213 $ 25,800
Level 1, 2 and 3        
Defined Benefit Plan Disclosure        
Total pension plan assets measured at fair value 23,026   21,448  
Level 1, 2 and 3 | Cash and cash equivalents        
Defined Benefit Plan Disclosure        
Total pension plan assets measured at fair value 419   398  
Level 1, 2 and 3 | Mutual funds        
Defined Benefit Plan Disclosure        
Total pension plan assets measured at fair value 5,816   5,453  
Level 1, 2 and 3 | U.S. Government securities        
Defined Benefit Plan Disclosure        
Total pension plan assets measured at fair value 3,087   2,697  
Level 1, 2 and 3 | Municipal/provincial bonds        
Defined Benefit Plan Disclosure        
Total pension plan assets measured at fair value 296   322  
Level 1, 2 and 3 | Corporate bonds        
Defined Benefit Plan Disclosure        
Total pension plan assets measured at fair value 13,408   12,578  
Level 1        
Defined Benefit Plan Disclosure        
Total pension plan assets measured at fair value 5,793   5,394  
Level 1 | Cash and cash equivalents        
Defined Benefit Plan Disclosure        
Total pension plan assets measured at fair value 419   398  
Level 1 | Mutual funds        
Defined Benefit Plan Disclosure        
Total pension plan assets measured at fair value 5,374   4,996  
Level 1 | U.S. Government securities        
Defined Benefit Plan Disclosure        
Total pension plan assets measured at fair value 0   0  
Level 1 | Municipal/provincial bonds        
Defined Benefit Plan Disclosure        
Total pension plan assets measured at fair value 0   0  
Level 1 | Corporate bonds        
Defined Benefit Plan Disclosure        
Total pension plan assets measured at fair value 0   0  
Level 2        
Defined Benefit Plan Disclosure        
Total pension plan assets measured at fair value 17,233   16,054  
Level 2 | Cash and cash equivalents        
Defined Benefit Plan Disclosure        
Total pension plan assets measured at fair value 0   0  
Level 2 | Mutual funds        
Defined Benefit Plan Disclosure        
Total pension plan assets measured at fair value 442   457  
Level 2 | U.S. Government securities        
Defined Benefit Plan Disclosure        
Total pension plan assets measured at fair value 3,087   2,697  
Level 2 | Municipal/provincial bonds        
Defined Benefit Plan Disclosure        
Total pension plan assets measured at fair value 296   322  
Level 2 | Corporate bonds        
Defined Benefit Plan Disclosure        
Total pension plan assets measured at fair value 13,408   12,578  
Level 3        
Defined Benefit Plan Disclosure        
Total pension plan assets measured at fair value 0   0  
Level 3 | Cash and cash equivalents        
Defined Benefit Plan Disclosure        
Total pension plan assets measured at fair value 0   0  
Level 3 | Mutual funds        
Defined Benefit Plan Disclosure        
Total pension plan assets measured at fair value 0   0  
Level 3 | U.S. Government securities        
Defined Benefit Plan Disclosure        
Total pension plan assets measured at fair value 0   0  
Level 3 | Municipal/provincial bonds        
Defined Benefit Plan Disclosure        
Total pension plan assets measured at fair value 0   0  
Level 3 | Corporate bonds        
Defined Benefit Plan Disclosure        
Total pension plan assets measured at fair value 0   0  
NAV        
Defined Benefit Plan Disclosure        
Total pension plan assets measured at fair value $ 10,032   $ 8,765