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Investments (Summary Of Components Of Net Realized Capital Gains (Losses)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairments	$ 5,157	$ 888	$ 8,090	$ 958
Total net realized capital gains (losses)	30,272	15,776	122,504	(9,125)
Fixed Maturity Securities [Member] | Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairments	5,157	888	8,090	958
Gains (losses) from sales	6,097	(43)	11,370	10,349
Fixed Maturity Securities [Member] | Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	356	(1,068)	356	(1,082)
Gains (losses) from fair value adjustments	0	958	13	958
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	(1,315)	(1,563)	3,733	(1,523)
Gains (losses) from fair value adjustments	30,362	17,800	114,803	(17,453)
Other Invested Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	(153)	581	243	584
Short-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	$ 82	$ (1)	$ 76	$ 0

X

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 8A
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Amount of realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
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The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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