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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
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
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 | $ (25,258) | $ (8,961) | $ (58,883) | $ (28,125)
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 | (2,081) | 23,044 | 20,335 | 106,854
Derivative, Gain (Loss) on Derivative, Net | (1,320) | 7,515 | 11,517 | 36,300
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 | (25,347) | (13,133) | 6,523 | (35,490)
Derivative, Gain (Loss) on Derivative, Net | (17,311) | (9,737) | (6,808) | (38,059)
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 | 32,133 | (6,205) | 62,242 | 16,518
Derivative, Gain (Loss) on Derivative, Net | $ 9,463 | $ (1,074) | $ 33,061 | $ 30,785

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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