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Derivative Instruments (Change in Fair Value of Derivatives Included in the Consolidated Statement of Operations) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Change in fair value of derivatives | $ (20,042) | $ 595,311 | $ 440,472 | $ 276,433
Change in fair value of embedded derivatives | 212,278 | 383,716 | 1,306,163 | (585,465)
Call Options |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Change in fair value of derivatives | (19,997) | 594,872 | 442,111 | 273,946
Interest Rate Swap |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Change in fair value of derivatives | (3) | 258 | (1,059) | 1,658
Interest Rate Caps |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Change in fair value of derivatives | (42) | 181 | (580) | 829
Fixed Index Annuities - Embedded Derivatives |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Change in fair value of embedded derivatives | 24,998 | 196,808 | 882,230 | (1,198,115)
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 | $ 187,280 | $ 186,908 | $ 423,933 | $ 612,650

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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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