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Investments (Summary Of Unrealized Appreciation (Depreciation) Of Available For Sale, Fixed Maturity And Equity Security Investments) (Details) - USD ($) $ in Thousands		Mar. 31, 2019	Dec. 31, 2018
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		$ 15,440,999	$ 15,406,572
Unrealized Appreciation		267,665	186,589
Unrealized Depreciation		(195,377)	(367,898)
Market Value		15,513,287	15,225,263
OTTI in AOCI	[1]	2,302	2,545
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		1,289,609	2,629,454
Unrealized Appreciation		17,236	16,781
Unrealized Depreciation		(9,732)	(15,101)
Market Value		1,297,113	2,631,134
OTTI in AOCI	[1]
Obligations Of U.S. States And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		485,643	490,018
Unrealized Appreciation		20,068	12,915
Unrealized Depreciation		(853)	(2,839)
Market Value		504,858	500,094
OTTI in AOCI	[1]		439
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		5,990,410	5,538,582
Unrealized Appreciation		83,444	48,465
Unrealized Depreciation		(57,322)	(141,515)
Market Value		6,016,532	5,445,532
OTTI in AOCI	[1]	1,872	1,688
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		719,151	545,427
Unrealized Appreciation		1,098	162
Unrealized Depreciation		(3,084)	(5,492)
Market Value		717,165	540,097
OTTI in AOCI	[1]
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		523,600	329,883
Unrealized Appreciation		10,178	2,167
Unrealized Depreciation		(2,270)	(5,340)
Market Value		531,508	326,710
OTTI in AOCI	[1]
Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		2,359,677	1,832,760
Unrealized Appreciation		16,919	7,325
Unrealized Depreciation		(29,318)	(43,821)
Market Value		2,347,278	1,796,264
OTTI in AOCI	[1]
Non-Agency Residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		9,765	10,198
Unrealized Appreciation		37	37
Unrealized Depreciation		(36)	(26)
Market Value		9,766	10,209
OTTI in AOCI	[1]
Foreign Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		1,295,808	1,335,328
Unrealized Appreciation		41,059	34,743
Unrealized Depreciation		(38,731)	(55,906)
Market Value		1,298,136	1,314,165
OTTI in AOCI	[1]		98
Foreign Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		2,767,336	2,694,922
Unrealized Appreciation		77,626	63,994
Unrealized Depreciation		(54,031)	(97,858)
Market Value		2,790,931	2,661,058
OTTI in AOCI	[1]	$ 430	$ 320
[1] Represents the amount of OTTI recognized in AOCI. Amount includes unrealized gains and losses on impaired securities relating to changes in the value of such securities subsequent to the impairment measurement date

X

- Definition

Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as available-for-sale that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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