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Pension and Other Postretirement Benefits (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Pension Benefits    
Components of net periodic benefit cost    
Service cost $ 2,007 $ 2,135
Interest cost 2,234 1,951
Expected return on plan assets (1,871) (2,547)
Settlement expense 0 1,419
Amortization of net loss (gain) 935 1,421
Amortization of prior service cost (credit) 69 71
Net periodic benefit cost 3,374 4,450
Postretirement Benefits    
Components of net periodic benefit cost    
Service cost 160 162
Interest cost 84 75
Expected return on plan assets 0 0
Settlement expense 0 0
Amortization of net loss (gain) (152) (65)
Amortization of prior service cost (credit) (34) (34)
Net periodic benefit cost $ 58 $ 138