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Derivative Instruments (Changes in Estimated Fair Value Related to Embedded Derivatives) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 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 | $ (14,151) | $ 3,684 | $ (33,625) | $ (19,164)
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 | 8,805 | 15,108 | 22,416 | 83,810
Derivative, Gain (Loss) on Derivative, Net | 5,987 | 2,941 | 12,836 | 28,785
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 | 6,519 | (5,955) | 31,870 | (22,357)
Derivative, Gain (Loss) on Derivative, Net | 3,966 | (6,925) | 10,503 | (28,322)
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 | 15,324 | 360 | 30,109 | 22,723
Derivative, Gain (Loss) on Derivative, Net | $ 12,472 | $ 3,023 | $ 23,598 | $ 31,859

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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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