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Pension and Other Post-Retirement Benefits - Pension and Post-Retirement Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Pension Benefits        
Components of net periodic (credit) expense:        
Interest cost [1] $ 1,173 $ 1,415 $ 2,346 $ 2,830
Expected return on plan assets [1] (3,876) (3,483) (7,752) (6,966)
Amortization of net actuarial loss [1] 1,831 2,509 3,662 5,018
Net periodic (credit) expense [1] (872) 441 (1,744) 882
Post- Retirement Benefits        
Components of net periodic (credit) expense:        
Interest cost [1] 82 128 164 256
Amortization of prior-service costs [1] (62) (62) (124) (124)
Amortization of net actuarial loss [1] 6 31 12 62
Net periodic (credit) expense [1] $ 26 $ 97 $ 52 $ 194
[1] Amounts are included in G&A expense on the Consolidated Statements of Income and Comprehensive Income.