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Derivative Instruments (Change in Fair Value of Derivative Instruments) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in fair value of derivatives | $ 906,906 | $ (777,848) | $ 1,677,871
Change in fair value of embedded derivatives | 1,454,042 | (1,389,491) | 919,735
Call Options |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in fair value of derivatives | 908,556 | (778,899) | 1,678,283
Interest Rate Swap |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in fair value of derivatives | (1,059) | 869 | 255
Interest Rate Caps |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in fair value of derivatives | (591) | 182 | (667)
Fixed Index Annuities - Embedded Derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in fair value of embedded derivatives | 562,302 | (2,167,628) | 174,154
Other Changes in Difference Between Policy Benefit Reserves Computed Using Derivative Accounting Vs. Long-Duration Contracts Accounting |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in fair value of embedded derivatives | $ 891,740 | $ 778,137 | $ 745,581

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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- Definition Net Increase or Decrease in the fair value of the embedded derivative or group of embedded derivatives included in earnings in the period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 15 -URI http://asc.fasb.org/subtopic&trid=2229187 + Details
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