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Post Retirement Benefits (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Pension, health and life insurance expense:        
Multi-employer plan $ 179 $ 157 $ 600 $ 549
Defined contribution plan 263 258 881 766
Total pension expense 442 415 1,481 1,315
Interest cost 41 58 122 177
Amortization of prior service credits (124) (124) (372) (372)
Amortization of net loss 43 46 130 135
Net periodic benefit credit (40) (20) (120) (60)
Total post-retirement benefits expense 402 $ 395 1,361 $ 1,255
Pension Plan        
Pension, health and life insurance expense:        
Payments made to pension plans     1,602  
Pension plan payments expected to be made in fiscal year 300   300  
Pension plan payments accrued 136   136  
Other Postretirement Benefits Plan        
Pension, health and life insurance expense:        
Payments for post retirement healthcare and life insurance     198  
Pension plan payments expected to be made in fiscal year 1,088   1,088  
Pension plan payments accrued $ 1,088   $ 1,088