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Pension and Other Postretirement Benefits (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Pension Benefits        
Components of net periodic benefit cost (income)        
Service cost $ 2,039 $ 2,402 $ 6,166 $ 7,180
Interest cost 2,016 2,194 6,161 7,244
Expected return on plan assets (2,463) (2,577) (7,409) (8,382)
Settlement expense 531 1,241 2,068 5,091
Amortization of net loss (gain) 845 1,356 2,961 3,663
Amortization of prior service cost (credit) 69 70 210 209
Net periodic benefit cost (income) 3,037 4,686 10,157 15,005
Postretirement Benefits        
Components of net periodic benefit cost (income)        
Service cost 168 150 503 450
Interest cost 75 108 226 324
Expected return on plan assets 0 0 0 0
Settlement expense 0 0 0 0
Amortization of net loss (gain) (80) (241) (240) (725)
Amortization of prior service cost (credit) (35) (35) (103) (103)
Net periodic benefit cost (income) $ 128 $ (18) $ 386 $ (54)