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Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Pension and Supplemental Executive Retirement Plans    
Components of Net Periodic Benefit Cost [Abstract]    
Company service cost (1) $ 500 $ 0
Interest cost 3,013 3,299
Expected return on plan assets (3,078) (3,442)
Net actuarial losses (gains) 947 546
Prior service cost (credit) 86 86
Cost of settlements and curtailments 0 0
Net periodic benefit cost (benefit) 1,468 489
Other Postretirement Benefit Plans    
Components of Net Periodic Benefit Cost [Abstract]    
Company service cost (1) 209 234
Interest cost 283 311
Expected return on plan assets (3,394) (2,911)
Net actuarial losses (gains) (961) (692)
Prior service cost (credit) 117 118
Cost of settlements and curtailments 0 0
Net periodic benefit cost (benefit) $ (3,746) $ (2,940)