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Federal Income Taxes (Tables)
12 Months Ended
Dec. 31, 2023
Income Tax Disclosure [Abstract]  
Schedule of Reconciliation of Federal Income Tax on Income at the Corporate Rate to the Effective Tax Rate
($ in thousands)202320222021
Tax at statutory rate $96,267 58,839 106,115 
Tax-advantaged interest(2,229)(4,087)(4,514)
Dividends received deduction(273)(469)(558)
Executive compensation1,989 1,848 2,469 
Stock-based compensation(1,804)(893)(693)
Other(776)62 (1,346)
Federal income tax expense93,174 55,300 101,473 
Income before federal income tax, less preferred stock dividends449,212 270,986 495,957 
Effective tax rate20.7 %20.4 %20.5 %
Schedule of Deferred Tax Assets and Liabilities
($ in thousands)20232022
Deferred tax assets:  
Net loss reserve discounting$73,175 65,907 
Net unearned premiums89,413 76,513 
Employee benefits13,777 7,064 
Long-term incentive compensation6,736 6,384 
Unrealized losses on fixed income securities74,183 110,857 
Temporary investment write-downs7,560 12,480 
Other8,080 9,824 
Total deferred tax assets272,924 289,029 
Deferred tax liabilities:  
Deferred policy acquisition costs89,221 77,411 
Other investment-related items, net33,309 26,713 
Accelerated depreciation and amortization10,157 12,172 
Total deferred tax liabilities132,687 116,296 
Net deferred federal income tax assets (liabilities)$140,237 172,733