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Post Retirement Benefits (Tables)
6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Schedule of Post Retirement Benefit Plans
The components of expense for the Company’s post-retirement benefit plans are as follows (in thousands):
Three months ended
June 30,
Six months ended
June 30,
2021202020212020
Pension expense:
Multi-employer plan
$232 $145 $421 $391 
Defined contribution plan
316 215 618 508 
Total pension expense548 360 1,039 899 
Health and life insurance:
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