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Investments (Investments in Fixed Maturity and Equity Securities Available-for-Sale by Sector) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 18,417,375 | $ 17,575,507
Estimated Fair Value | $ 19,543,237 | $ 17,708,156
% of Total | 100.00% | 100.00%
Fixed maturity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 30,076,884 | $ 28,322,977
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 3,274,262 | 1,939,175
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 190,170 | 619,247
Estimated Fair Value | $ 33,160,976 | $ 29,642,905
% of Total | 100.00% | 100.00%
Other-than-temporary impairments in AOCI | $ (1,634) | $ (1,555)
Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 416,041 | 126,229
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 10,527 | 7,837
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 8,382 | 8,204
Estimated Fair Value | $ 418,186 | $ 125,862
% of Total | 100.00% | 100.00%
Corporate Debt Securities [Member] | Fixed maturity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 18,417,375 | $ 17,575,507
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1,260,330 | 599,718
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 134,468 | 467,069
Estimated Fair Value | $ 19,543,237 | $ 17,708,156
% of Total | 58.90% | 59.70%
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 | 2,607,276 | 2,469,009
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 1,497,998 | 1,110,282
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 2,532
Estimated Fair Value | $ 4,105,274 | $ 3,576,759
% of Total | 12.40% | 12.10%
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 | 1,225,718 | 1,277,998
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 72,733 | 45,152
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 5,673 | 11,673
Estimated Fair Value | $ 1,292,778 | $ 1,311,477
% of Total | 3.90% | 4.40%
Other-than-temporary impairments in AOCI | $ (300) | $ (300)
Asset-backed securities | Fixed maturity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,377,736 | 1,219,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 11,054 | 12,052
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 32,113 | 18,376
Estimated Fair Value | $ 1,356,677 | $ 1,212,676
% of Total | 4.10% | 4.10%
Other-than-temporary impairments in AOCI | $ (275) | $ (354)
Commercial Mortgage Backed Securities [Member] | Fixed maturity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,441,091 | 1,456,848
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 67,727 | 37,407
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 1,125 | 11,168
Estimated Fair Value | $ 1,507,693 | $ 1,483,087
% of Total | 4.50% | 5.00%
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 | 1,907,648 | 1,423,791
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 99,690 | 15,586
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 57,718
Estimated Fair Value | $ 2,007,338 | $ 1,381,659
% of Total | 6.10% | 4.70%
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 | 538,037 | 480,067
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 74,042 | 40,014
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 6,137 | 9,067
Estimated Fair Value | $ 605,942 | $ 511,014
% 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 | 2,562,003 | 2,420,757
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 190,688 | 78,964
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 10,654 | 41,644
Estimated Fair Value | $ 2,742,037 | $ 2,458,077
% of Total | 8.30% | 8.30%
Other-than-temporary impairments in AOCI | $ 0 | $ 0
Nonredeemable Preferred Stock [Member] | Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 66,464 | 85,645
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 2,575 | 7,837
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 7,936 | 5,962
Estimated Fair Value | $ 61,103 | $ 87,520
% of Total | 14.60% | 69.50%
Other equity securities | Equity securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 349,577 | $ 40,584
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 7,952 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 446 | 2,242
Estimated Fair Value | $ 357,083 | $ 38,342
% of Total | 85.40% | 30.50%

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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=73527792&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=66004124&loc=SL7669686-108580 + Details
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