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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, 2018 | Dec. 31, 2017
--- | --- | ---
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | $ 39,005,212 | $ 38,150,820
Non Redeemable Preferred Stock Equity Method Investments Fair Value Disclosure |  | 39,806
Equity Method Investments, Fair Value Disclosure | 101,069 | 60,346
Funds withheld at interest embedded derivatives | 142,529 | 122,194
Cash and cash equivalents | 657,280 | 356,788
Short-term investments | 186,051 | 50,746
Investments, Fair Value Disclosure | 313,439 | 356,154
Other Assets, Fair Value Disclosure | 46,090 | 40,659
Assets, Fair Value Disclosure | 40,451,670 | 39,177,513
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 906,199 | 1,014,228
Liabilities Fair Value Disclosure |  |
Financial Liabilities Fair Value Disclosure | 920,131 | 1,038,469
Interest Rate Swap [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 29,106 | 51,359
Liabilities Fair Value Disclosure |  |
Other liabilities | (14,166) | (14,311)
Foreign Currency Forwards |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 6,881 | 730
Liabilities Fair Value Disclosure |  |
Other liabilities |  | (7,213)
Consumer Price Index Swap [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | (13) | (221)
Liabilities Fair Value Disclosure |  |
Other liabilities | (2,696) | (1,939)
Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 212,315 | 218,541
Credit Default Swaps |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 5,961 | 5,908
Liabilities Fair Value Disclosure |  |
Other liabilities | (684) | (760)
Equity Option [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 16,818 | 16,932
Liabilities Fair Value Disclosure |  |
Other liabilities | (2,554) | (6,339)
Currency Swap [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 42,371 | 62,905
Liabilities Fair Value Disclosure |  |
Other liabilities |  | (6,194)
Mortality Swap [Member] |  |
Liabilities Fair Value Disclosure |  |
Other liabilities | (308) | (1,683)
Corporate Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 24,449,498 | 23,210,968
Canadian and Canadian provincial governments |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 4,036,750 | 4,220,076
Residential mortgage-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,780,762 | 1,719,880
Asset-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,863,017 | 1,648,362
Assets, Fair Value Disclosure | 64,475 | 0
Commercial Mortgage Backed Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,273,534 | 1,303,387
US Treasury and Government [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,412,409 | 1,943,592
US States and Political Subdivisions Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 911,991 | 703,428
Debt Security, Government, Non-US [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 3,277,251 | 3,401,127
Fair Value Inputs Level 1 Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,284,932 | 1,818,006
Non Redeemable Preferred Stock Equity Method Investments Fair Value Disclosure |  | 39,806
Equity Method Investments, Fair Value Disclosure | 57,584 | 60,346
Funds withheld at interest embedded derivatives | 0 | 0
Cash and cash equivalents | 657,280 | 354,071
Short-term investments | 5,957 | 0
Investments, Fair Value Disclosure | 211,253 | 217,618
Other Assets, Fair Value Disclosure | 0 | 0
Assets, Fair Value Disclosure | 2,217,006 | 2,489,847
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 | 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] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 0 | 0
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 | 211,253 | 217,618
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
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 Treasury and Government [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,284,932 | 1,818,006
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 | 35,792,145 | 34,098,204
Non Redeemable Preferred Stock Equity Method Investments Fair Value Disclosure |  | 0
Equity Method Investments, Fair Value Disclosure | 0 | 0
Funds withheld at interest embedded derivatives | 0 | 0
Cash and cash equivalents | 0 | 2,717
Short-term investments | 177,891 | 47,650
Investments, Fair Value Disclosure | 102,186 | 138,536
Other Assets, Fair Value Disclosure | 0 | 0
Assets, Fair Value Disclosure | 36,072,222 | 34,287,107
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 0 | 0
Liabilities Fair Value Disclosure |  |
Financial Liabilities Fair Value Disclosure | 13,624 | 22,558
Fair Value Inputs Level 2 Member | Interest Rate Swap [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 29,106 | 51,359
Liabilities Fair Value Disclosure |  |
Other liabilities | (14,166) | (14,311)
Fair Value Inputs Level 2 Member | Foreign Currency Forwards |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 6,881 | 730
Liabilities Fair Value Disclosure |  |
Other liabilities |  | (7,213)
Fair Value Inputs Level 2 Member | Consumer Price Index Swap [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | (13) | (221)
Liabilities Fair Value Disclosure |  |
Other liabilities | (2,696) | (1,939)
Fair Value Inputs Level 2 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 1,062 | 923
Fair Value Inputs Level 2 Member | Credit Default Swaps |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 5,961 | 5,908
Liabilities Fair Value Disclosure |  |
Other liabilities | (684) | (760)
Fair Value Inputs Level 2 Member | Equity Option [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 16,818 | 16,932
Liabilities Fair Value Disclosure |  |
Other liabilities | (2,554) | (6,339)
Fair Value Inputs Level 2 Member | Currency Swap [Member] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 42,371 | 62,905
Liabilities Fair Value Disclosure |  |
Other liabilities |  | (6,194)
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 | 23,193,563 | 21,873,696
Fair Value Inputs Level 2 Member | Canadian and Canadian provincial governments |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 3,488,008 | 3,626,134
Fair Value Inputs Level 2 Member | Residential mortgage-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,780,762 | 1,611,998
Fair Value Inputs Level 2 Member | Asset-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,780,250 | 1,524,888
Fair Value Inputs Level 2 Member | Commercial Mortgage Backed Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,271,752 | 1,300,153
Fair Value Inputs Level 2 Member | US Treasury and Government [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 107,225 | 103,075
Fair Value Inputs Level 2 Member | US States and Political Subdivisions Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 898,346 | 662,225
Fair Value Inputs Level 2 Member | Debt Security, Government, Non-US [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 3,272,239 | 3,396,035
Fair Value Inputs Level 3 Member |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,928,135 | 2,234,610
Non Redeemable Preferred Stock Equity Method Investments Fair Value Disclosure |  | 0
Equity Method Investments, Fair Value Disclosure | 43,485 | 0
Funds withheld at interest embedded derivatives | 142,529 | 122,194
Cash and cash equivalents | 0 | 0
Short-term investments | 2,203 | 3,096
Investments, Fair Value Disclosure | 0 | 0
Other Assets, Fair Value Disclosure | 46,090 | 40,659
Assets, Fair Value Disclosure | 2,162,442 | 2,400,559
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 906,199 | 1,014,228
Liabilities Fair Value Disclosure |  |
Financial Liabilities Fair Value Disclosure | 906,507 | 1,015,911
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 | 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] |  |
Assets Fair Value Disclosure |  |
Investments, Fair Value Disclosure | 0 | 0
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
Fair Value Inputs Level 3 Member | Mortality Swap [Member] |  |
Liabilities Fair Value Disclosure |  |
Other liabilities | (308) | (1,683)
Fair Value Inputs Level 3 Member | Corporate Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,255,935 | 1,337,272
Fair Value Inputs Level 3 Member | Canadian and Canadian provincial governments |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 548,742 | 593,942
Fair Value Inputs Level 3 Member | Residential mortgage-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 0 | 107,882
Fair Value Inputs Level 3 Member | Asset-backed securities |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 82,767 | 123,474
Fair Value Inputs Level 3 Member | Commercial Mortgage Backed Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 1,782 | 3,234
Fair Value Inputs Level 3 Member | US Treasury and Government [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 20,252 | 22,511
Fair Value Inputs Level 3 Member | US States and Political Subdivisions Debt Securities [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | 13,645 | 41,203
Fair Value Inputs Level 3 Member | Debt Security, Government, Non-US [Member] |  |
Assets Fair Value Disclosure |  |
Fixed maturity securities, available-for-sale | $ 5,012 | $ 5,092

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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 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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