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Investments (Summary Of Components Of Net Realized Capital Gains (Losses)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairments	$ (7,314)	$ (3,825)	$ (15,404)	$ (4,783)
Total net realized capital gains (losses)	(12,943)	54,804	109,561	45,679
Fixed Maturity Securities [Member] | Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairments	(7,314)	(3,825)	(15,404)	(4,783)
Gains (losses) from sales	5,290	738	16,660	11,087
Fixed Maturity Securities [Member] | Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales		(717)	356	(1,799)
Gains (losses) from fair value adjustments		584	13	1,542
Equity Securities [Member] | Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	(1,192)	9,507	2,541	7,984
Gains (losses) from fair value adjustments	(12,008)	47,653	102,795	30,200
Other Invested Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	2,098	913	2,341	1,497
Short-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	$ 183	$ (49)	$ 259	$ (49)

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- Definition

The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 320
-SubTopic 10
-Section 45
-Paragraph 8A
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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