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Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Balances of Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | $ 28,063,975 | $ 25,480,972
Funds withheld at interest embedded derivatives | (3,329) | 22,094
Cash and cash equivalents | 665,037 | 899,846
Short-term investments | 34,733 | 45,190
Investments, Fair Value Disclosure | 469,324 | 490,590
Other Assets, Fair Value Disclosure | 10,853 | 7,727
Assets, Fair Value Disclosure, Recurring | 29,240,593 | 26,946,419
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 1,069,154 | 1,085,166
Liabilities Fair Value Disclosure |  |
Other liabilities |  | 1,127,720
Liabilities, Fair Value Disclosure, Recurring | 1,095,323 |
Nonredeemable Preferred Stock [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 90,574 | 99,363
Other equity securities |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 37,094 | 27,497
Other |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 9,852 | 6,420
Interest Rate Swaps |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 52,864 | 84,578
Liabilities Fair Value Disclosure |  |
Other liabilities | 16,152 | 12,957
Interest Rate Options |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure |  | 18,195
Foreign Currency Forwards |  |
Liabilities Fair Value Disclosure |  |
Other liabilities | 7,422 | 15,011
Currency Swap [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 88,303 | 70,906
Liabilities Fair Value Disclosure |  |
Other liabilities | 413 |
Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 137,529 | 140,344
Consumer Price Index Swaps |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | (23) | (561)
Credit Default Swaps |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 8,248 | 8,606
Liabilities Fair Value Disclosure |  |
Other liabilities | 428 | 419
Equity Option [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 44,883 | 35,242
Mortality Swap [Member] |  |
Liabilities Fair Value Disclosure |  |
Other liabilities | 1,754 | 797
Purchase Commitment [Member] |  |
Liabilities Fair Value Disclosure |  |
Other liabilities |  | 13,370
Corporate Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 16,489,406 | 14,885,583
Canadian and Canadian provincial governments |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 3,793,807 | 3,865,265
Residential mortgage-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,190,879 | 1,037,896
Asset-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,062,624 | 1,069,586
Commercial Mortgage Backed Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,525,469 | 1,532,591
US Treasury And Government Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,263,998 | 525,851
US States and Political Subdivisions Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 506,172 | 426,076
Foreign Government Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 2,231,620 | 2,138,124
Fair Value Inputs Level 1 Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,537,021 | 838,946
Funds withheld at interest embedded derivatives | 0 | 0
Cash and cash equivalents | 665,037 | 899,846
Short-term investments | 20,896 | 21,536
Investments, Fair Value Disclosure | 258,002 | 260,116
Other Assets, Fair Value Disclosure | 0 | 0
Assets, Fair Value Disclosure, Recurring | 2,480,956 | 2,020,444
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 0 | 0
Liabilities Fair Value Disclosure |  |
Other liabilities |  | 0
Liabilities, Fair Value Disclosure, Recurring | 0 |
Fair Value Inputs Level 1 Member | Nonredeemable Preferred Stock [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 78,186 | 91,450
Fair Value Inputs Level 1 Member | Other equity securities |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 37,094 | 27,497
Fair Value Inputs Level 1 Member | Other |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 9,852 | 6,420
Fair Value Inputs Level 1 Member | Interest Rate Swaps |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 0 | 0
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 | 0
Fair Value Inputs Level 1 Member | Interest Rate Options |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure |  | 0
Fair Value Inputs Level 1 Member | Foreign Currency Forwards |  |
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 | 0
Fair Value Inputs Level 1 Member | Currency Swap [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 0 | 0
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 |
Fair Value Inputs Level 1 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 132,870 | 134,749
Fair Value Inputs Level 1 Member | Consumer Price Index Swaps |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 0 | 0
Fair Value Inputs Level 1 Member | Credit Default Swaps |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 0 | 0
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 | 0
Fair Value Inputs Level 1 Member | Equity Option [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 0 | 0
Fair Value Inputs Level 1 Member | Mortality Swap [Member] |  |
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 | 0
Fair Value Inputs Level 1 Member | Purchase Commitment [Member] |  |
Liabilities Fair Value Disclosure |  |
Other liabilities |  | 0
Fair Value Inputs Level 1 Member | Corporate Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 157,790 | 115,822
Fair Value Inputs Level 1 Member | Canadian and Canadian provincial governments |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 0 | 0
Fair Value Inputs Level 1 Member | Residential mortgage-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 0 | 0
Fair Value Inputs Level 1 Member | Asset-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 0 | 0
Fair Value Inputs Level 1 Member | Commercial Mortgage Backed Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 0 | 0
Fair Value Inputs Level 1 Member | US Treasury And Government Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,111,189 | 437,129
Fair Value Inputs Level 1 Member | US States and Political Subdivisions Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 0 | 0
Fair Value Inputs Level 1 Member | Foreign Government Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 268,042 | 285,995
Fair Value Inputs Level 2 Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 24,250,730 | 22,392,896
Funds withheld at interest embedded derivatives | 0 | 0
Cash and cash equivalents | 0 | 0
Short-term investments | 13,837 | 23,654
Investments, Fair Value Disclosure | 198,934 | 222,570
Other Assets, Fair Value Disclosure | 0 | 0
Assets, Fair Value Disclosure, Recurring | 24,463,501 | 22,639,120
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 0 | 0
Liabilities Fair Value Disclosure |  |
Other liabilities |  | 41,757
Liabilities, Fair Value Disclosure, Recurring | 24,415 |
Fair Value Inputs Level 2 Member | Nonredeemable Preferred Stock [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 0 | 9
Fair Value Inputs Level 2 Member | Other equity securities |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 0 | 0
Fair Value Inputs Level 2 Member | Other |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 0 | 0
Fair Value Inputs Level 2 Member | Interest Rate Swaps |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 52,864 | 84,578
Liabilities Fair Value Disclosure |  |
Other liabilities | 16,152 | 12,957
Fair Value Inputs Level 2 Member | Interest Rate Options |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure |  | 18,195
Fair Value Inputs Level 2 Member | Foreign Currency Forwards |  |
Liabilities Fair Value Disclosure |  |
Other liabilities | 7,422 | 15,011
Fair Value Inputs Level 2 Member | Currency Swap [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 88,303 | 70,906
Liabilities Fair Value Disclosure |  |
Other liabilities | 413 |
Fair Value Inputs Level 2 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 4,659 | 5,595
Fair Value Inputs Level 2 Member | Consumer Price Index Swaps |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | (23) | (561)
Fair Value Inputs Level 2 Member | Credit Default Swaps |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 8,248 | 8,606
Liabilities Fair Value Disclosure |  |
Other liabilities | 428 | 419
Fair Value Inputs Level 2 Member | Equity Option [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 44,883 | 35,242
Fair Value Inputs Level 2 Member | Mortality Swap [Member] |  |
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 | 0
Fair Value Inputs Level 2 Member | Purchase Commitment [Member] |  |
Liabilities Fair Value Disclosure |  |
Other liabilities |  | 13,370
Fair Value Inputs Level 2 Member | Corporate Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 15,094,299 | 13,459,334
Fair Value Inputs Level 2 Member | Canadian and Canadian provincial governments |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 3,793,807 | 3,865,265
Fair Value Inputs Level 2 Member | Residential mortgage-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 892,503 | 849,802
Fair Value Inputs Level 2 Member | Asset-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 482,114 | 496,626
Fair Value Inputs Level 2 Member | Commercial Mortgage Backed Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,447,650 | 1,445,845
Fair Value Inputs Level 2 Member | US Treasury And Government Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 125,450 | 60,193
Fair Value Inputs Level 2 Member | US States and Political Subdivisions Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 465,986 | 383,365
Fair Value Inputs Level 2 Member | Foreign Government Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,948,921 | 1,832,466
Fair Value Inputs Level 3 Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 2,276,224 | 2,249,130
Funds withheld at interest embedded derivatives | (3,329) | 22,094
Cash and cash equivalents | 0 | 0
Short-term investments | 0 | 0
Investments, Fair Value Disclosure | 12,388 | 7,904
Other Assets, Fair Value Disclosure | 10,853 | 7,727
Assets, Fair Value Disclosure, Recurring | 2,296,136 | 2,286,855
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 1,069,154 | 1,085,166
Liabilities Fair Value Disclosure |  |
Other liabilities |  | 1,085,963
Liabilities, Fair Value Disclosure, Recurring | 1,070,908 |
Fair Value Inputs Level 3 Member | Nonredeemable Preferred Stock [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 12,388 | 7,904
Fair Value Inputs Level 3 Member | Other equity securities |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 0 | 0
Fair Value Inputs Level 3 Member | Other |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 0 | 0
Fair Value Inputs Level 3 Member | Interest Rate Swaps |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 0 | 0
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 | 0
Fair Value Inputs Level 3 Member | Interest Rate Options |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure |  | 0
Fair Value Inputs Level 3 Member | Foreign Currency Forwards |  |
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 | 0
Fair Value Inputs Level 3 Member | Currency Swap [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 0 | 0
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 |
Fair Value Inputs Level 3 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 0 | 0
Fair Value Inputs Level 3 Member | Consumer Price Index Swaps |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 0 | 0
Fair Value Inputs Level 3 Member | Credit Default Swaps |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 0 | 0
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 | 0
Fair Value Inputs Level 3 Member | Equity Option [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 0 | 0
Fair Value Inputs Level 3 Member | Mortality Swap [Member] |  |
Liabilities Fair Value Disclosure |  |
Other liabilities | 1,754 | 797
Fair Value Inputs Level 3 Member | Purchase Commitment [Member] |  |
Liabilities Fair Value Disclosure |  |
Other liabilities |  | 0
Fair Value Inputs Level 3 Member | Corporate Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,237,317 | 1,310,427
Fair Value Inputs Level 3 Member | Canadian and Canadian provincial governments |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 0 | 0
Fair Value Inputs Level 3 Member | Residential mortgage-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 298,376 | 188,094
Fair Value Inputs Level 3 Member | Asset-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 580,510 | 572,960
Fair Value Inputs Level 3 Member | Commercial Mortgage Backed Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 77,819 | 86,746
Fair Value Inputs Level 3 Member | US Treasury And Government Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 27,359 | 28,529
Fair Value Inputs Level 3 Member | US States and Political Subdivisions Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 40,186 | 42,711
Fair Value Inputs Level 3 Member | Foreign Government Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | $ 14,657 | $ 19,663

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- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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