v3.26.1
Components of Pension and Other Postretirement Benefit Plans Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Pension Benefits        
Defined Contribution Plan Disclosure [Line Items]        
Service Cost $ 300 $ 275 $ 600 $ 550
Interest Cost 5,729 6,343 11,459 12,685
Expected Return on Plan Assets (7,479) (7,565) (14,958) (15,130)
Amortization of Prior Service Credits 0 0 0 0
Recognized Net Actuarial Loss (Gain) 2,467 2,158 4,935 4,316
Net Periodic Benefit Cost 1,017 1,211 2,036 2,421
Other Postretirement Benefits        
Defined Contribution Plan Disclosure [Line Items]        
Service Cost 28 38 57 70
Interest Cost 2,347 2,987 4,694 5,892
Expected Return on Plan Assets 0 0 0 0
Amortization of Prior Service Credits (602) (601) (1,203) (1,202)
Recognized Net Actuarial Loss (Gain) (1,019) (685) (2,039) (1,369)
Net Periodic Benefit Cost $ 754 $ 1,739 $ 1,509 $ 3,391