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Pension and Other Post-Retirement Benefits (Tables)
9 Months Ended
Sep. 30, 2021
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs The following table presents the components of pension expense for the Company's significant pension plans. The Company's other pension and post-retirement benefit plans are not significant individually or in the aggregate.
Three Months Ended
September 30,
Nine Months Ended
September 30,
2021202020212020
Interest cost$1,877 $3,321 $5,630 $9,871 
Expected return on plan assets(6,322)(4,930)(18,965)(16,078)
Amortization of actuarial loss2,944 2,871 8,833 8,569 
Total$(1,501)$1,262 $(4,502)$2,362