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Pension and Other Post-Retirement Benefits - Pension and Post-Retirement Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Pension Benefits    
Components of net periodic (credit) expense:    
Interest cost [1] $ 912 $ 1,173
Expected return on plan assets [1] (4,016) (3,876)
Amortization of net actuarial loss [1] 1,732 1,831
Net periodic (credit) expense [1] (1,372) (872)
Post- Retirement Benefits    
Components of net periodic (credit) expense:    
Interest cost [1] 56 82
Amortization of prior-service liability [1] (62) (62)
Amortization of net actuarial loss [1] 11 6
Net periodic (credit) expense [1] $ 5 $ 26
[1] Amounts are included in G&A expense on the Consolidated Statements of Income and Comprehensive Income.