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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Statement of Comprehensive Income [Abstract]      
Net Income $ 294,191 $ 284,184 $ 176,769
Other Comprehensive Income (Loss):      
Unrealized Gain (Loss) on Available-for-Sale Securities, net of tax (expense) benefit of $(51), $115 and $52 192 (432) (196)
Pension and Other Postretirement Benefit Plan, net of tax expense of $14, $2,769 and $766 41 7,871 2,179
Total Other Comprehensive Income 233 7,439 1,983
Total Comprehensive Income $ 294,424 $ 291,623 $ 178,752