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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 $ 446,061 $ 298,569 $ 297,860
Other comprehensive (loss) income, net of tax      
Change in unrealized holding gains (losses) on available-for-sale securities 27,784 (58,692) (17,112)
Pension and other postretirement plans (33,770) 76,566 69,967
Total other comprehensive (loss) income, net of tax (5,986) 17,874 52,855
Comprehensive income $ 440,075 $ 316,443 $ 350,715