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Income Taxes (Reconciliation Of Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Computed tax expense at 35%	$ 58,480	$ 24,753	$ 24,699
Tax-exempt interest income	(26,038)	(26,197)	(26,993)
Dividends received deduction	(2,296)	(2,303)	(1,613)
State tax expense	158	1,907	(287)
Nondeductible expenses	348	303	575
Cumulative impact from change in tax rate	(11,449)	0	0
Reduction of AMT credit carryforward due to sequestration	4,088	0	0
Other, net	(1,083)	(783)	(293)
Income tax expense (benefit)	$ 22,208	$ (2,320)	$ (3,912)

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Effective Income Tax Rate Reconciliation, Reduction to Alternative Minimum Tax Credit, Amount

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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