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Investments (Fair Value and Losses by Investment Category and Length of Time in a Loss Position) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Fixed Maturities [Member] |  |
Estimated Fair Values And Gross Unrealized Losses OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 5,407,190 | $ 1,445,262
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 234,184 | 22,324
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 554,529 | 414,211
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 80,715 | 109,930
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 5,961,719 | 1,859,473
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 314,899 | 132,254
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] |  |
Estimated Fair Values And Gross Unrealized Losses OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 5,007,606 | 1,242,157
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 223,122 | 18,284
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 468,956 | 272,112
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 63,135 | 42,960
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 5,476,562 | 1,514,269
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 286,257 | 61,244
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | Corporate Debt Securities [Member] |  |
Estimated Fair Values And Gross Unrealized Losses OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 3,141,179 | 786,203
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 148,895 | 13,276
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 301,303 | 108,187
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 40,548 | 17,386
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 3,442,482 | 894,390
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 189,443 | 30,662
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | Canadian Provincial Governments [Member] |  |
Estimated Fair Values And Gross Unrealized Losses OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 188,491 | 12,349
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 14,419 | 174
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 12,029 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 2,429 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 200,520 | 12,349
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 16,848 | 174
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | Residential Mortgage Backed Securities [Member] |  |
Estimated Fair Values And Gross Unrealized Losses OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 283,967 | 22,288
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 15,900 | 97
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 23,068 | 19,394
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 1,688 | 3,199
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 307,035 | 41,682
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 17,588 | 3,296
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | Asset-backed Securities [Member] |  |
Estimated Fair Values And Gross Unrealized Losses OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 255,656 | 59,119
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 4,916 | 449
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 56,668 | 96,179
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 4,983 | 9,508
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 312,324 | 155,298
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 9,899 | 9,957
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | Commercial Mortgage Backed Securities [Member] |  |
Estimated Fair Values And Gross Unrealized Losses OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 219,110 | 89,507
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 3,725 | 797
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 20,068 | 29,181
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 5,745 | 7,974
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 239,178 | 118,688
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 9,470 | 8,771
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | US Government Agencies Debt Securities [Member] |  |
Estimated Fair Values And Gross Unrealized Losses OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 133,697 | 7,272
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 4,469 | 24
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 4,406 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 279 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 138,103 | 7,272
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 4,748 | 24
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Estimated Fair Values And Gross Unrealized Losses OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 120,193 | 20,602
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 9,723 | 1,514
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 15,202 | 11,736
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 4,616 | 4,132
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 135,395 | 32,338
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 14,339 | 5,646
Fixed Maturities [Member] | External Credit Rating, Investment Grade [Member] | Foreign Government Debt Securities [Member] |  |
Estimated Fair Values And Gross Unrealized Losses OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 665,313 | 244,817
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 21,075 | 1,953
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 36,212 | 7,435
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 2,847 | 761
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 701,525 | 252,252
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 23,922 | 2,714
Fixed Maturities [Member] | External Credit Rating, Non Investment Grade [Member] |  |
Estimated Fair Values And Gross Unrealized Losses OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 399,584 | 203,105
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 11,062 | 4,040
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 85,573 | 142,099
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 17,580 | 66,970
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 485,157 | 345,204
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 28,642 | 71,010
Fixed Maturities [Member] | External Credit Rating, Non Investment Grade [Member] | Corporate Debt Securities [Member] |  |
Estimated Fair Values And Gross Unrealized Losses OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 283,603 | 181,168
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 9,451 | 3,170
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 38,256 | 39,123
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 3,892 | 5,501
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 321,859 | 220,291
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 13,343 | 8,671
Fixed Maturities [Member] | External Credit Rating, Non Investment Grade [Member] | Residential Mortgage Backed Securities [Member] |  |
Estimated Fair Values And Gross Unrealized Losses OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 62,146 | 15,199
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 1,075 | 80
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 3,945 | 2,633
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 254 | 347
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 66,091 | 17,832
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 1,329 | 427
Fixed Maturities [Member] | External Credit Rating, Non Investment Grade [Member] | Asset-backed Securities [Member] |  |
Estimated Fair Values And Gross Unrealized Losses OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 28,670 | 3,421
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 415 | 26
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 32,392 | 31,938
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 5,498 | 18,815
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 61,062 | 35,359
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 5,913 | 18,841
Fixed Maturities [Member] | External Credit Rating, Non Investment Grade [Member] | Commercial Mortgage Backed Securities [Member] |  |
Estimated Fair Values And Gross Unrealized Losses OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 15,762 | 3,317
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 81 | 764
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 10,980 | 68,405
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 7,936 | 42,307
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 26,742 | 71,722
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 8,017 | 43,071
Fixed Maturities [Member] | External Credit Rating, Non Investment Grade [Member] | Foreign Government Debt Securities [Member] |  |
Estimated Fair Values And Gross Unrealized Losses OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 9,403 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 40 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 9,403 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 40 |
Equity Securities [Member] |  |
Estimated Fair Values And Gross Unrealized Losses OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 270,220 | 90,951
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 7,227 | 1,186
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 32,551 | 5,679
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 2,474 | 118
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 302,771 | 96,630
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 9,701 | 1,304
Equity Securities [Member] | Nonredeemable Preferred Stock [Member] |  |
Estimated Fair Values And Gross Unrealized Losses OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 51,386 | 5,577
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 5,479 | 52
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 1 | 5,679
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 2 | 118
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 51,387 | 11,256
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | 5,481 | 170
Equity Securities [Member] | Equity Securities Other Than Non-redeemable Preferred Stock [Member] |  |
Estimated Fair Values And Gross Unrealized Losses OTTI Impairment Losses Reported In AOCI [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 218,834 | 85,374
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses | 1,748 | 1,134
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 32,550 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses | 2,472 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 251,384 | 85,374
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses | $ 4,220 | $ 1,134

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