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Post Retirement Benefits (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Pension, health and life insurance expense:        
Multi-employer plan $ 232 $ 145 $ 421 $ 391
Defined contribution plan 316 215 618 508
Total pension expense 548 360 1,039 899
Interest cost 40 59 81 118
Amortization of prior service credits (124) (124) (248) (248)
Amortization of net loss 44 45 87 90
Net periodic benefit credit (40) (20) (80) (40)
Total post retirement benefits expense 508 $ 340 959 $ 859
Pension Plan        
Pension, health and life insurance expense:        
Payments made to pension plans     683  
Pension plan payments expected to be made in fiscal year 1,332   1,332  
Pension plan payments accrued 772   772  
Other Postretirement Benefits Plan        
Pension, health and life insurance expense:        
Payments for post retirement healthcare and life insurance     157  
Pension plan payments expected to be made in fiscal year 1,129   1,129  
Pension plan payments accrued $ 1,129   $ 1,129