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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Defined Benefit Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1,112 $ 1,678 $ 2,221 $ 2,634
Interest cost 3,737 4,826 7,518 9,666
Expected return on plan assets (4,902) (5,434) (9,823) (10,878)
Amortization of prior service cost (credit) 43 16 86 32
Recognized actuarial loss (gain) 2,356 1,831 4,715 3,664
Net periodic benefit cost (credit) 2,346 2,917 4,717 5,118
Postretirement Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 35 50 70 100
Amortization of prior service cost (credit) (509) (509) (1,018) (1,018)
Recognized actuarial loss (gain) (19) (96) (38) (192)
Net periodic benefit cost (credit) $ (493) $ (555) $ (986) $ (1,110)