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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 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | $ 49,481,267 | $ 39,992,346
Equity Method Investments, Fair Value Disclosure | 134,453 | 82,197
Funds withheld at interest embedded derivatives | 121,275 | 109,597
Cash and cash equivalents | 927,175 | 485,167
Short-term investments | 89,130 | 105,991
Investments, Fair Value Disclosure | 394,376 | 378,469
Other Assets, Fair Value Disclosure | 51,620 | 47,789
Assets, Fair Value Disclosure | 51,199,296 | 41,201,556
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 989,170 | 944,865
Liabilities Fair Value Disclosure |  |
Financial Liabilities Fair Value Disclosure | 1,037,260 | 972,314
Interest Rate Swap [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 73,085 | 37,976
Liabilities Fair Value Disclosure |  |
Other liabilities | (26,024) | (18,542)
Swap [Member] |  |
Liabilities Fair Value Disclosure |  |
Other liabilities | (12,454) |
Foreign Currency Forwards |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 43,654 | 50,740
Liabilities Fair Value Disclosure |  |
Other liabilities | 124 |
Consumer Price Index Swap [Member] |  |
Liabilities Fair Value Disclosure |  |
Other liabilities | (32,885) | (11,384)
Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 252,277 | 197,770
Credit Default Swaps |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | (7,174) | 4,466
Liabilities Fair Value Disclosure |  |
Other liabilities | 12,923 | 371
Equity Option [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 6,150 | 36,206
Liabilities Fair Value Disclosure |  |
Other liabilities | 18,694 | 6,630
Currency Swap [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 26,384 | 51,311
Liabilities Fair Value Disclosure |  |
Other liabilities | (7,615) | (4,155)
Mortality Swap [Member] |  |
Liabilities Fair Value Disclosure |  |
Other liabilities | (853) | (369)
Corporate Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 30,353,219 | 23,982,119
Canadian and Canadian provincial governments |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 4,633,219 | 3,892,385
Residential mortgage-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 2,439,842 | 1,869,221
Asset-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 2,822,635 | 2,149,204
Assets, Fair Value Disclosure | 102,027 | 77,842
Commercial Mortgage Backed Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,782,218 | 1,419,034
US Government Agencies Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,668,505 | 2,185,874
Assets, Fair Value Disclosure | 17,141 | 18,025
US States and Political Subdivisions Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,190,103 | 752,194
Debt Security, Government, Non-US [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 4,591,526 | 3,742,315
Fair Value Inputs Level 1 Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,541,294 | 2,067,529
Equity Method Investments, Fair Value Disclosure | 86,968 | 48,737
Funds withheld at interest embedded derivatives | 0 | 0
Cash and cash equivalents | 922,291 | 473,509
Short-term investments | 17,375 | 4,989
Investments, Fair Value Disclosure | 197,195 | 196,781
Other Assets, Fair Value Disclosure | 0 | 0
Assets, Fair Value Disclosure | 2,765,123 | 2,791,545
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 0 | 0
Liabilities Fair Value Disclosure |  |
Financial Liabilities Fair Value Disclosure | 0 | 0
Fair Value Inputs Level 1 Member | Interest Rate Swap [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 0 | 0
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 | 0
Fair Value Inputs Level 1 Member | Swap [Member] |  |
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 |
Fair Value Inputs Level 1 Member | Foreign Currency Forwards |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 0 | 0
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 |
Fair Value Inputs Level 1 Member | Consumer Price Index Swap [Member] |  |
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 | 0
Fair Value Inputs Level 1 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 197,195 | 196,781
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
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 | 0
Fair Value Inputs Level 1 Member | Mortality Swap [Member] |  |
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 | 0
Fair Value Inputs Level 1 Member | Corporate Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 0 | 0
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 Government Agencies Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,541,294 | 2,067,529
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 | Debt Security, Government, Non-US [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 0 | 0
Fair Value Inputs Level 2 Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 45,244,476 | 35,930,086
Equity Method Investments, Fair Value Disclosure | 0 | 0
Funds withheld at interest embedded derivatives | 0 | 0
Cash and cash equivalents | 4,884 | 11,658
Short-term investments | 68,898 | 98,774
Investments, Fair Value Disclosure | 197,181 | 181,688
Other Assets, Fair Value Disclosure | 0 | 0
Assets, Fair Value Disclosure | 45,515,439 | 36,222,206
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 0 | 0
Liabilities Fair Value Disclosure |  |
Financial Liabilities Fair Value Disclosure | 47,237 | 27,080
Fair Value Inputs Level 2 Member | Interest Rate Swap [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 73,085 | 37,976
Liabilities Fair Value Disclosure |  |
Other liabilities | (26,024) | (18,542)
Fair Value Inputs Level 2 Member | Swap [Member] |  |
Liabilities Fair Value Disclosure |  |
Other liabilities | (12,454) |
Fair Value Inputs Level 2 Member | Foreign Currency Forwards |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 43,654 | 50,740
Liabilities Fair Value Disclosure |  |
Other liabilities | 124 |
Fair Value Inputs Level 2 Member | Consumer Price Index Swap [Member] |  |
Liabilities Fair Value Disclosure |  |
Other liabilities | (32,885) | (11,384)
Fair Value Inputs Level 2 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 55,082 | 989
Fair Value Inputs Level 2 Member | Credit Default Swaps |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | (7,174) | 4,466
Liabilities Fair Value Disclosure |  |
Other liabilities | 12,923 | 371
Fair Value Inputs Level 2 Member | Equity Option [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 6,150 | 36,206
Liabilities Fair Value Disclosure |  |
Other liabilities | 18,694 | 6,630
Fair Value Inputs Level 2 Member | Currency Swap [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 26,384 | 51,311
Liabilities Fair Value Disclosure |  |
Other liabilities | (7,615) | (4,155)
Fair Value Inputs Level 2 Member | Mortality Swap [Member] |  |
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 | 0
Fair Value Inputs Level 2 Member | Corporate Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 28,547,959 | 22,651,194
Fair Value Inputs Level 2 Member | Canadian and Canadian provincial governments |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 3,942,376 | 3,364,261
Fair Value Inputs Level 2 Member | Residential mortgage-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 2,416,762 | 1,862,366
Fair Value Inputs Level 2 Member | Asset-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 2,719,526 | 2,053,632
Fair Value Inputs Level 2 Member | Commercial Mortgage Backed Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,752,250 | 1,419,012
Fair Value Inputs Level 2 Member | US Government Agencies Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 110,070 | 100,320
Fair Value Inputs Level 2 Member | US States and Political Subdivisions Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,180,150 | 741,992
Fair Value Inputs Level 2 Member | Debt Security, Government, Non-US [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 4,575,383 | 3,737,309
Fair Value Inputs Level 3 Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 2,695,497 | 1,994,731
Equity Method Investments, Fair Value Disclosure | 47,485 | 33,460
Funds withheld at interest embedded derivatives | 121,275 | 109,597
Cash and cash equivalents | 0 | 0
Short-term investments | 2,857 | 2,228
Investments, Fair Value Disclosure | 0 | 0
Other Assets, Fair Value Disclosure | 51,620 | 47,789
Assets, Fair Value Disclosure | 2,918,734 | 2,187,805
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 989,170 | 944,865
Liabilities Fair Value Disclosure |  |
Financial Liabilities Fair Value Disclosure | 990,023 | 945,234
Fair Value Inputs Level 3 Member | Interest Rate Swap [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 0 | 0
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 | 0
Fair Value Inputs Level 3 Member | Swap [Member] |  |
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 |
Fair Value Inputs Level 3 Member | Foreign Currency Forwards |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 0 | 0
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 |
Fair Value Inputs Level 3 Member | Consumer Price Index Swap [Member] |  |
Liabilities Fair Value Disclosure |  |
Other liabilities | 0 | 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 | 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
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 | 0
Fair Value Inputs Level 3 Member | Mortality Swap [Member] |  |
Liabilities Fair Value Disclosure |  |
Other liabilities | (853) | (369)
Fair Value Inputs Level 3 Member | Corporate Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,805,260 | 1,330,925
Fair Value Inputs Level 3 Member | Canadian and Canadian provincial governments |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 690,843 | 528,124
Fair Value Inputs Level 3 Member | Residential mortgage-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 23,080 | 6,855
Fair Value Inputs Level 3 Member | Asset-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 103,109 | 95,572
Fair Value Inputs Level 3 Member | Commercial Mortgage Backed Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 29,968 | 22
Fair Value Inputs Level 3 Member | US Government Agencies Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 17,141 | 18,025
Fair Value Inputs Level 3 Member | US States and Political Subdivisions Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 9,953 | 10,202
Fair Value Inputs Level 3 Member | Debt Security, Government, Non-US [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | $ 16,143 | $ 5,006

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- Definition Embedded derivatives related to funds held by the ceding insurer on behalf the reinsurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder, which represent an asset for the reinsurer. There is another concept for the corresponding liability of the ceding insurer. + References No definition available. + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities. + References No definition available. + Details
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