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Consolidated Statements of Comprehensive Income (unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Statement of Comprehensive Income [Abstract]        
Net Income $ 85,937 $ 42,069 $ 157,940 $ 72,398
Other Comprehensive Income (Loss):        
Unrealized Loss on Available-for-Sale Securities, net of tax benefit of $20, $10, $81, and $20 (74) (40) (305) (75)
Pension and Other Postretirement Benefits, net of tax benefit (expense) of $(37), $(50), $29, and $(103) 106 141 (84) 291
Total Other Comprehensive Income (Loss) 32 101 (389) 216
Total Comprehensive Income $ 85,969 $ 42,170 $ 157,551 $ 72,614