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Income Taxes (Reconciliation Of Income Taxes) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Computed tax expense (benefit) at 21% for 2019 and 2018 and 35% for 2017 $ 79,394 $ (6,429) $ 58,480
Tax-exempt interest income (12,909) (13,507) (26,038)
Dividends received deduction (1,276) (1,082) (2,296)
State tax (benefit) expense (869) 439 158
Nondeductible expenses 526 390 348
Change in federal tax contingency reserve (2,588) 0 0
Cumulative impact from change in federal tax rate 0 0 (11,449)
(Reversal in 2018) reduction of AMT credit carryforward due to sequestration in 2017 0 (4,088) 4,088
Other, net (4,296) (610) (1,083)
Income tax expense (benefit) $ 57,982 $ (24,887) $ 22,208