Investments (Summary Of Components Of Net Realized Capital Gains (Losses)) (Details) - USD ($)	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairments		$ (2,933,000)
Total net realized capital gains (losses)	(210,588,000)	92,232,000
Balance as of December 31, 2019	0
Balance as of March 31, 2020	(21,774,000)
Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Allowance for credit losses	(21,774,000)
Balance as of December 31, 2019
Provision for credit losses	(21,774,000)
Balance as of March 31, 2020	(21,774,000)
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Balance as of March 31, 2020	(21,774,000)
Fixed Maturity Securities [Member] \| Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Allowance for credit losses	(21,774,000)
Other-than-temporary impairments		(2,933,000)
Gains (losses) from sales	(14,076,000)	5,273,000
Provision for credit losses	(21,774,000)
Fixed Maturity Securities [Member] \| Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales
Gains (losses) from fair value adjustments	(1,123,000)	13,000
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Balance as of March 31, 2020	(17,305,000)
Corporate Securities [Member] \| Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Allowance for credit losses	(17,305,000)
Balance as of December 31, 2019
Provision for credit losses	(17,305,000)
Balance as of March 31, 2020	(17,305,000)
Equity Securities [Member] \| Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	(27,599,000)	5,048,000
Gains (losses) from fair value adjustments	(144,003,000)	84,441,000
Other Invested Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	(2,327,000)	396,000
Short-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	314,000	$ (6,000)
Foreign Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Balance as of March 31, 2020	(519,000)
Foreign Government Securities [Member] \| Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Allowance for credit losses	(519,000)
Balance as of December 31, 2019
Provision for credit losses	(519,000)
Balance as of March 31, 2020	(519,000)
Foreign Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Balance as of March 31, 2020	(3,950,000)
Foreign Corporate Securities [Member] \| Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Allowance for credit losses	(3,950,000)
Balance as of December 31, 2019
Provision for credit losses	(3,950,000)
Balance as of March 31, 2020	$ (3,950,000)

Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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