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Derivative Instruments (Fair Value of Derivative Instruments as Presented in the Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative assets | $ 888,208 | $ 205,149
Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 888,267 | 206,100
Derivative liabilities | 9,281,998 | 8,165,405
Not Designated as Hedging Instrument | Call Options |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 888,208 | 205,149
Not Designated as Hedging Instrument | Interest Rate Caps |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 59 | 597
Not Designated as Hedging Instrument | Interest Rate Swap |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 0 | 354
Derivative liabilities | 881 | 0
Not Designated as Hedging Instrument | Fixed Index Annuities - Embedded Derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liabilities | $ 9,281,117 | $ 8,165,405

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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + Details
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