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Employee Benefit Plans - Change in PBO (Details) - USD ($)
 12 Months Ended
Mar. 25, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Change in projected benefit obligation:        
Balance, January 1   $ 34,009,000 $ 26,892,000  
Service cost   1,614,000 1,430,000 $ 1,707,000
Interest cost   1,127,000 1,169,000 1,037,000
Actuarial loss   933,000 5,164,000  
Benefits paid   (726,000) (646,000)  
Balance, December 31   36,957,000 34,009,000 26,892,000
Change in plan assets:        
Fair value, January 1   25,689,000 19,672,000  
Actual return on plan assets   4,725,000 5,164,000  
Employer contribution $ 500,000 500,000 1,610,000  
Expenses paid   (104,000) (111,000)  
Benefits paid   (726,000) (646,000)  
Fair value, December 31   30,084,000 25,689,000 $ 19,672,000
Funded status at end of year   (6,873,000) (8,320,000)  
Accumulated benefit obligation   30,156,000 26,380,000  
Amounts recognized in the statement of financial position consist of the following:        
Noncurrent liabilities   (6,873,000) (8,320,000)  
Net amount recognized at December 31, balance sheet   $ (6,873,000) $ (8,320,000)