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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Defined Benefit Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1,015 $ 923 $ 3,236 $ 3,557
Interest cost 3,729 4,812 11,247 14,478
Expected return on plan assets (4,899) (5,402) (14,722) (16,280)
Amortization of prior service cost (credit) 37 16 123 48
Recognized actuarial loss (gain) 2,355 1,832 7,070 5,496
Net periodic benefit cost (credit) 2,237 2,181 6,954 7,299
Postretirement Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Interest cost 35 50 104 150
Amortization of prior service cost (credit) (509) (510) (1,528) (1,528)
Recognized actuarial loss (gain) (19) (96) (56) (288)
Net periodic benefit cost (credit) $ (493) $ (556) $ (1,480) $ (1,666)