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Derivative Instruments (Changes in Estimated Fair Value Related to Embedded Derivatives) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements And Variable Annuity Contracts [Member] |  |
Changes In Estimated Fair Value Related To Embedded Derivatives [Line Items] |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | $ 13,611 | $ 68,702
Derivative, Gain (Loss) on Derivative, Net | 6,850 | 25,844
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 | 25,351 | (16,402)
Derivative, Gain (Loss) on Derivative, Net | 6,537 | (21,396)
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 | 14,785 | 22,363
Derivative, Gain (Loss) on Derivative, Net | $ 11,126 | $ 28,836

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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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