v3.26.3
Employee Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Pension and SERPA Benefits:        
Defined Benefit Plan Disclosure        
Service cost $ 878 $ 963 $ 2,634 $ 2,889
Interest cost 19,946 20,501 59,838 61,505
Expected return on plan assets (30,444) (32,799) (91,332) (98,397)
Amortization of unrecognized: Prior service cost 252 380 756 1,140
Amortization of unrecognized: Net gain (loss) 1,054 (174) 3,162 (522)
Special retirement benefit cost 0 0 2,952 0
Net periodic benefit income (8,314) (11,129) (21,990) (33,385)
Postretirement Healthcare Benefits:        
Defined Benefit Plan Disclosure        
Service cost 532 643 1,596 1,929
Interest cost 2,243 2,618 6,729 7,854
Expected return on plan assets (4,736) (4,675) (14,208) (14,025)
Amortization of unrecognized: Prior service cost 149 149 447 447
Amortization of unrecognized: Net gain (loss) (1,562) (1,369) (4,686) (4,107)
Net periodic benefit income $ (3,374) $ (2,634) $ (10,122) $ (7,902)