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Derivative Instruments (Changes in Estimated Fair Value Related to Embedded Derivatives) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Changes In Estimated Fair Value Related To Embedded Derivatives [Line Items] |  |  |  |
Gain Loss On Investments Related To Change In Fair Value Of Derivatives Excluding Embedded Derivatives | $ (8,961) | $ (5,427) | $ (28,125) | $ 89,408
Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements |  |  |  |
Changes In Estimated Fair Value Related To Embedded Derivatives [Line Items] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | 23,044 | 49,078 | 106,854 | 33,795
Derivative, Gain (Loss) on Derivative, Net | 7,515 | 9,653 | 36,300 | 1,683
Embedded Derivatives In Equity Indexed Annuities [Member] |  |  |  |
Changes In Estimated Fair Value Related To Embedded Derivatives [Line Items] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | (13,133) | (20,104) | (35,490) | (20,730)
Derivative, Gain (Loss) on Derivative, Net | (9,737) | (13,397) | (38,059) | (9,979)
Embedded Derivatives In Variable Annuity Contracts [Member] |  |  |  |
Changes In Estimated Fair Value Related To Embedded Derivatives [Line Items] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | (6,205) | 7,988 | 16,518 | (83,089)
Derivative, Gain (Loss) on Derivative, Net | $ (1,074) | $ 2,595 | $ 30,785 | $ (63,415)

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- Definition This item represents the amount recognized in investment related gains (losses) related to the change in the fair value of derivatives, excluding embedded derivatives. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 + Details
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