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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Statement of Comprehensive Income [Abstract]        
Net Income $ 91,974 $ 84,239 $ 236,424 $ 242,179
Other Comprehensive Income (Loss):        
Unrealized Gain (Loss) on Available-for-Sale Securities, net of tax (expense) benefit of $4, $46, $(1) and $127 (17) (171) 2 (476)
Pension and Other Postretirement Benefits, net of tax expense of $108, $37, $90 and $8 310 106 257 22
Total Other Comprehensive Income (Loss) 293 (65) 259 (454)
Total Comprehensive Income $ 92,267 $ 84,174 $ 236,683 $ 241,725