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Fair Value (Activity Under Level 3, Fair Value Measurements Using Significant Unobservable Inputs By Asset Type) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Transfers in and/or (out) of Level 3 |  |  | $ 4,695 | $ 2,942
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date |  |  |  |
Market Value [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance fixed maturities |  |  | 435,959 | 217,138
Total gains or (losses) (realized/unrealized) Included in earnings |  |  | 4,925 | (752)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss) |  |  | 3,502 | 1,091
Purchases, issuances and settlements |  |  | 323,898 | 215,540
Transfers in and/or (out) of Level 3 |  |  | 4,695 | 2,942
Ending balance |  |  | 772,979 | 435,959
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date |  |  |  |
Market Value [Member] | Corporate Securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance fixed maturities |  |  | 428,215 | 210,186
Total gains or (losses) (realized/unrealized) Included in earnings |  |  | 4,937 | (92)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss) |  |  | (20) | 1,091
Purchases, issuances and settlements |  |  | 179,761 | 215,838
Transfers in and/or (out) of Level 3 |  |  | 4,695 | 1,192
Ending balance |  |  | 617,588 | 428,215
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date |  |  |  |
Market Value [Member] | Asset Backed Securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance fixed maturities |  |  |  |
Total gains or (losses) (realized/unrealized) Included in earnings |  |  |  |
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss) |  |  | 3,632 |
Purchases, issuances and settlements |  |  | 150,009 |
Transfers in and/or (out) of Level 3 |  |  |  |
Ending balance |  |  | 153,641 |
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date |  |  |  |
Market Value [Member] | Foreign Corporate Securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance fixed maturities |  |  | 7,744 | 6,952
Total gains or (losses) (realized/unrealized) Included in earnings |  |  | (12) | (660)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss) |  |  | (110) |
Purchases, issuances and settlements |  |  | (5,872) | (298)
Transfers in and/or (out) of Level 3 |  |  |  | 1,750
Ending balance |  |  | 1,750 | 7,744
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date |  |  |  |
Fair Value [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance fixed maturities |  |  | 2,337 |
Total gains or (losses) (realized/unrealized) Included in earnings |  |  | 2,163 | (293)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss) |  |  |  |
Purchases, issuances and settlements |  |  | 1,326 | 2,630
Transfers in and/or (out) of Level 3 |  |  |  |
Ending balance |  |  | 5,826 | 2,337
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date |  |  | 1,795 |
Fair Value [Member] | Foreign Corporate Securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance fixed maturities |  |  | 2,337 |
Total gains or (losses) (realized/unrealized) Included in earnings |  |  | 2,163 | (293)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss) |  |  |  |
Purchases, issuances and settlements |  |  | 1,326 | 2,630
Transfers in and/or (out) of Level 3 |  |  |  |
Ending balance |  |  | 5,826 | 2,337
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date |  |  | $ 1,795 |

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- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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