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Investments (Investments in Fixed Maturity and Equity Securities Available-for-Sale by Sector) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | $ 11,697,394 | $ 11,333,431 |
Available-for-sale Securities, Fair Value Disclosure | 12,110,755 | 12,380,071 |
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities | (2,896) | (6,434) | 1,236
Fixed Maturities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 20,270,734 | 19,559,432 |
Available-for-sale Securities, Gross Unrealized Gains | 1,518,301 | 2,864,436 |
Available-for-sale Securities, Gross Unrealized Losses | 314,899 | 132,254 |
Available-for-sale Securities, Fair Value Disclosure | 21,474,136 | 22,291,614 |
Percentage Of Total Available For Sale Securities | 100.00% | 100.00% |
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities | (4,168) | (8,625) |
Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 409,472 | 217,046 |
Available-for-sale Securities, Gross Unrealized Gains | 5,960 | 6,958 |
Available-for-sale Securities, Gross Unrealized Losses | 9,701 | 1,304 |
Available-for-sale Securities, Fair Value Disclosure | 405,731 | 222,700 |
Percentage Of Total Available For Sale Securities | 100.00% | 100.00% |
Corporate Debt Securities [Member] | Fixed Maturities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 11,697,394 | 11,333,431 |
Available-for-sale Securities, Gross Unrealized Gains | 616,147 | 1,085,973 |
Available-for-sale Securities, Gross Unrealized Losses | 202,786 | 39,333 |
Available-for-sale Securities, Fair Value Disclosure | 12,110,755 | 12,380,071 |
Percentage Of Total Available For Sale Securities | 56.40% | 55.50% |
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities | 0 | 0 |
Canadian Provincial Governments [Member] | Fixed Maturities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 2,728,111 | 2,676,777 |
Available-for-sale Securities, Gross Unrealized Gains | 669,762 | 1,372,731 |
Available-for-sale Securities, Gross Unrealized Losses | 16,848 | 174 |
Available-for-sale Securities, Fair Value Disclosure | 3,381,025 | 4,049,334 |
Percentage Of Total Available For Sale Securities | 15.70% | 18.20% |
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities | 0 | 0 |
Residential Mortgage Backed Securities [Member] | Fixed Maturities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 970,434 | 969,267 |
Available-for-sale Securities, Gross Unrealized Gains | 38,126 | 76,520 |
Available-for-sale Securities, Gross Unrealized Losses | 18,917 | 3,723 |
Available-for-sale Securities, Fair Value Disclosure | 989,643 | 1,042,064 |
Percentage Of Total Available For Sale Securities | 4.60% | 4.70% |
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities | (300) | (241) |
Asset-backed Securities [Member] | Fixed Maturities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 891,751 | 700,455 |
Available-for-sale Securities, Gross Unrealized Gains | 18,893 | 19,898 |
Available-for-sale Securities, Gross Unrealized Losses | 15,812 | 28,798 |
Available-for-sale Securities, Fair Value Disclosure | 894,832 | 691,555 |
Percentage Of Total Available For Sale Securities | 4.20% | 3.10% |
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities | (2,259) | (2,259) |
Commercial Mortgage Backed Securities [Member] | Fixed Maturities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 1,314,782 | 1,608,376 |
Available-for-sale Securities, Gross Unrealized Gains | 91,651 | 142,369 |
Available-for-sale Securities, Gross Unrealized Losses | 17,487 | 51,842 |
Available-for-sale Securities, Fair Value Disclosure | 1,388,946 | 1,698,903 |
Percentage Of Total Available For Sale Securities | 6.50% | 7.60% |
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities | (1,609) | (6,125) |
US Government and Government Agencies and Authorities [Member] | Fixed Maturities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 489,631 | 231,256 |
Available-for-sale Securities, Gross Unrealized Gains | 16,468 | 33,958 |
Available-for-sale Securities, Gross Unrealized Losses | 4,748 | 24 |
Available-for-sale Securities, Fair Value Disclosure | 501,351 | 265,190 |
Percentage Of Total Available For Sale Securities | 2.30% | 1.20% |
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities | 0 | 0 |
US States and Political Subdivisions Debt Securities [Member] | Fixed Maturities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 313,252 | 270,086 |
Available-for-sale Securities, Gross Unrealized Gains | 21,907 | 38,058 |
Available-for-sale Securities, Gross Unrealized Losses | 14,339 | 5,646 |
Available-for-sale Securities, Fair Value Disclosure | 320,820 | 302,498 |
Percentage Of Total Available For Sale Securities | 1.50% | 1.40% |
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities | 0 | 0 |
Foreign Government Debt Securities [Member] | Fixed Maturities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 1,865,379 | 1,769,784 |
Available-for-sale Securities, Gross Unrealized Gains | 45,347 | 94,929 |
Available-for-sale Securities, Gross Unrealized Losses | 23,962 | 2,714 |
Available-for-sale Securities, Fair Value Disclosure | 1,886,764 | 1,861,999 |
Percentage Of Total Available For Sale Securities | 8.80% | 8.30% |
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities | 0 | 0 |
Nonredeemable Preferred Stock [Member] | Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 81,993 | 68,469 |
Available-for-sale Securities, Gross Unrealized Gains | 5,342 | 6,542 |
Available-for-sale Securities, Gross Unrealized Losses | 5,481 | 170 |
Available-for-sale Securities, Fair Value Disclosure | 81,854 | 74,841 |
Percentage Of Total Available For Sale Securities | 20.20% | 33.60% |
Equity Securities Other Than Non-redeemable Preferred Stock [Member] | Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis | 327,479 | 148,577 |
Available-for-sale Securities, Gross Unrealized Gains | 618 | 416 |
Available-for-sale Securities, Gross Unrealized Losses | 4,220 | 1,134 |
Available-for-sale Securities, Fair Value Disclosure | $ 323,877 | $ 147,859 |
Percentage Of Total Available For Sale Securities | 79.80% | 66.40% |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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