Accumulated Other Comprehensive Loss (Schedule Of Amounts Reclassified Out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain (Loss) on Investments, Excluding Other than Temporary Impairments			$ 4,276	$ 1,256
Income Tax Expense (Benefit)	$ (6,812)	$ (6,303)	(14,459)	(12,169)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	2,054	3,126	2,927	5,869
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain (Loss) on Investments, Excluding Other than Temporary Impairments	0	(845)	(4,276)	(845)
Income Tax Expense (Benefit)	0	312	1,578	312
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ 0	$ (533)	$ (2,698)	$ (533)