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Investments (Investments in Fixed Maturity and Equity Securities Available-for-Sale by Sector) (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 16,000,887 | $ 14,010,604
Unrealized Losses | 393,841 | 134,919
Estimated Fair Value | $ 16,489,406 | $ 14,885,583
% of Total | 100.00% | 100.00%
Fixed maturity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 26,305,332 | $ 23,105,597
Unrealized Gains | 2,147,882 | 2,508,673
Unrealized Losses | 389,239 | 133,298
Estimated Fair Value | $ 28,063,975 | $ 25,480,972
% of Total | 100.00% | 100.00%
Other-than-temporary impairments in AOCI | $ 1,555 | $ (1,555)
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 129,359 | 120,534
Unrealized Gains | 2,911 | 7,947
Unrealized Losses | 4,602 | 1,621
Estimated Fair Value | $ 127,668 | $ 126,860
% of Total | 100.00% | 100.00%
Corporate Debt Securities [Member] | Fixed maturity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 16,000,887 | $ 14,010,604
Unrealized Gains | 730,409 | 965,523
Unrealized Losses | 241,890 | 90,544
Estimated Fair Value | $ 16,489,406 | $ 14,885,583
% of Total | 58.80% | 58.40%
Other-than-temporary impairments in AOCI | $ 0 | $ 0
Canadian and Canadian provincial governments | Fixed maturity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2,655,763 | 2,668,852
Unrealized Gains | 1,140,904 | 1,196,420
Unrealized Losses | 2,860 | 7
Estimated Fair Value | $ 3,793,807 | $ 3,865,265
% of Total | 13.50% | 15.20%
Other-than-temporary impairments in AOCI | $ 0 | $ 0
Residential mortgage-backed securities | Fixed maturity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,154,732 | 991,867
Unrealized Gains | 47,241 | 52,640
Unrealized Losses | 11,094 | 6,611
Estimated Fair Value | $ 1,190,879 | $ 1,037,896
% of Total | 4.20% | 4.10%
Other-than-temporary impairments in AOCI | $ (300) | $ (300)
Asset-backed securities | Fixed maturity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,051,093 | 1,059,660
Unrealized Gains | 19,915 | 20,301
Unrealized Losses | 8,384 | 10,375
Estimated Fair Value | $ 1,062,624 | $ 1,069,586
% of Total | 3.80% | 4.20%
Other-than-temporary impairments in AOCI | $ 354 | $ 354
Commercial Mortgage Backed Securities [Member] | Fixed maturity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,471,419 | 1,453,657
Unrealized Gains | 63,699 | 87,593
Unrealized Losses | 9,649 | 8,659
Estimated Fair Value | $ 1,525,469 | $ 1,532,591
% of Total | 5.40% | 6.00%
Other-than-temporary impairments in AOCI | $ (1,609) | $ (1,609)
US Treasury and Government [Member] | Fixed maturity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,332,518 | 501,352
Unrealized Gains | 18,149 | 25,014
Unrealized Losses | 86,669 | 515
Estimated Fair Value | $ 1,263,998 | $ 525,851
% of Total | 4.50% | 2.00%
Other-than-temporary impairments in AOCI | $ 0 | $ 0
US States and Political Subdivisions Debt Securities [Member] | Fixed maturity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 478,262 | 378,457
Unrealized Gains | 38,891 | 51,117
Unrealized Losses | 10,981 | 3,498
Estimated Fair Value | $ 506,172 | $ 426,076
% of Total | 1.80% | 1.70%
Other-than-temporary impairments in AOCI | $ 0 | $ 0
Foreign Government Debt Securities [Member] | Fixed maturity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2,160,658 | 2,041,148
Unrealized Gains | 88,674 | 110,065
Unrealized Losses | 17,712 | 13,089
Estimated Fair Value | $ 2,231,620 | $ 2,138,124
% of Total | 8.00% | 8.40%
Other-than-temporary impairments in AOCI | $ 0 | $ 0
Nonredeemable Preferred Stock [Member] | Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 91,717 | 93,540
Unrealized Gains | 2,477 | 7,350
Unrealized Losses | 3,620 | 1,527
Estimated Fair Value | $ 90,574 | $ 99,363
% of Total | 70.90% | 78.30%
Other equity securities | Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 37,642 | $ 26,994
Unrealized Gains | 434 | 597
Unrealized Losses | 982 | 94
Estimated Fair Value | $ 37,094 | $ 27,497
% of Total | 29.10% | 21.70%

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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 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 2: 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=36458714&loc=SL7669686-108580 + Details
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