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Pension Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2020
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,
2020201920202019
Interest cost$3,321 $4,552 $9,871 $13,450 
Expected return on plan assets(4,930)(4,995)(16,078)(14,924)
Amortization of actuarial loss2,871 2,708 8,569 7,676 
Total$1,262 $2,265 $2,362 $6,202