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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Statement of Comprehensive Income [Abstract]    
Net Income $ 62,481 $ 72,003
Other Comprehensive Income (Loss):    
Unrealized Gain (Loss) on Available-for-Sale Securities, net of tax (expense) benefit of $(21) and $61 80 (231)
Pension and Other Postretirement Benefits, net of tax benefit of $9 and $67 (26) (190)
Total Other Comprehensive Income (Loss) 54 (421)
Total Comprehensive Income $ 62,535 $ 71,582