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Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Pension and Supplemental Executive Retirement Plans          
Components of Net Periodic Benefit Cost [Abstract]          
Company service cost $ 0   $ 0 $ 0 $ 0
Interest cost 3,247   3,297 9,741 10,278
Expected return on plan assets (3,644)   (3,426) (10,932) (10,432)
Net actuarial losses (gains) 522   529 1,568 1,656
Prior service cost (credit) 87   87 259 259
Cost of settlements and curtailments 0   334 0 9,181
Net periodic benefit cost (benefit) 212   821 636 10,942
Other Postretirement Benefit Plans          
Components of Net Periodic Benefit Cost [Abstract]          
Company service cost 417   374 1,251 1,122
Interest cost 376   409 1,126 1,225
Expected return on plan assets (2,493)   (2,059) (7,481) (6,176)
Net actuarial losses (gains) (382)   (38) (1,142) (113)
Prior service cost (credit) 454   465 1,360 1,396
Cost of settlements and curtailments 0   0 0 0
Net periodic benefit cost (benefit) $ (1,628)   $ (849) $ (4,886) $ (2,546)
Pension Plan          
Components of Net Periodic Benefit Cost [Abstract]          
Company contribution to qualified pension plan   $ 23,000