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Post Retirement Benefits - Schedule of Post Retirement Benefits Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension expense:      
Multi-employer plan $ 857 $ 676 $ 971
Defined contribution plans 1,231 1,173 1,258
Total pension expense 2,088 1,849 2,229
Health and life insurance:      
Interest cost 161 235 285
Amortization of prior service credits (496) (496) (496)
Amortization of net loss 173 181 117
Net periodic benefit credit (162) (80) (94)
Total post retirement benefits expense $ 1,926 $ 1,769 $ 2,135