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Pension Benefit Plans (Tables)
 6 Months Ended
Jun. 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
June 30,		Six Months Ended
June 30,
2020201920202019
Interest cost$3,275  $4,449  $6,550  $8,898  
Expected return on plan assets(5,574) (4,964) (11,148) (9,929) 
Amortization of actuarial loss2,849  2,484  5,698  4,968  
Total$550  $1,969  $1,100  $3,937