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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

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- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 9A -URI http://asc.fasb.org/extlink&oid=109979856&loc=SL6284427-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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