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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Statement of Comprehensive Income [Abstract]        
Net Income $ 81,969 $ 85,937 $ 144,450 $ 157,940
Other Comprehensive Income (Loss):        
Unrealized Gain (Loss) on Available-for-Sale Securities, net of tax (expense) benefit of $16, $20, $(5) and $81 (61) (74) 19 (305)
Pension and Other Postretirement Benefits, net of tax benefit (expense) of $9, $(37), $19 and $29 (27) 106 (53) (84)
Total Other Comprehensive Income (Loss) (88) 32 (34) (389)
Total Comprehensive Income $ 81,881 $ 85,969 $ 144,416 $ 157,551