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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Statement of Comprehensive Income [Abstract]        
Net Income $ 77,728 $ 86,995 $ 145,827 $ 161,333
Other Comprehensive Income (Loss):        
Unrealized Gain (Loss) on Available-for-Sale Securities, net of tax (expense) benefit of $0, $71, ($66) and $74 12 (269) 225 (282)
Pension and Other Postretirement Benefits, net of tax benefit of $4, $10, $8 and $36 (12) (29) (23) (103)
Total Other Comprehensive Income (Loss) 0 (298) 202 (385)
Total Comprehensive Income $ 77,728 $ 86,697 $ 146,029 $ 160,948