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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Market Value [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance fixed maturities | $ 1,495,500 | $ 951,712 | $ 1,330,224 | $ 772,979
Total gains or (losses) (realized/unrealized) Included in earnings | (13,418) | (224) | (19,372) | (434)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss) | 12,107 | 17,503 | 11,857 | (1,736)
Purchases, issuances and settlements | 31,545 | 58,665 | 203,025 | 256,847
Transfer in and/or (out) of Level 3 |  | (3,818) |  | (3,818)
Ending balance | 1,525,734 | 1,023,838 | 1,525,734 | 1,023,838
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 | (22,194) |  | (22,194) | (539)
Market Value [Member] | Corporate Securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance fixed maturities | 704,542 | 713,081 | 701,492 | 617,588
Total gains or (losses) (realized/unrealized) Included in earnings | (13,761) | (248) | (15,550) | (462)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss) | 4,582 | (549) | 7,418 | (3,906)
Purchases, issuances and settlements | 10,208 | 14,345 | 12,211 | 113,409
Transfer in and/or (out) of Level 3 |  | (4,795) |  | (4,795)
Ending balance | 705,571 | 721,834 | 705,571 | 721,834
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 | (17,279) |  | (17,279) | (539)
Market Value [Member] | Asset Backed Securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance fixed maturities | 785,360 | 238,631 | 623,033 | 153,641
Total gains or (losses) (realized/unrealized) Included in earnings | 206 | 121 | (3,962) | 125
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss) | 7,610 | 18,092 | 4,475 | 2,210
Purchases, issuances and settlements | 22,100 | 38,886 | 191,730 | 139,754
Transfer in and/or (out) of Level 3 |  |  |  |
Ending balance | 815,276 | 295,730 | 815,276 | 295,730
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 | (4,915) |  | (4,915) |
Market Value [Member] | Foreign Corporate Securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance fixed maturities | 5,598 |  | 5,699 | 1,750
Total gains or (losses) (realized/unrealized) Included in earnings | 137 | (97) | 140 | (97)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss) | (85) | (40) | (36) | (40)
Purchases, issuances and settlements | (763) | 5,434 | (916) | 3,684
Transfer in and/or (out) of Level 3 |  | 977 |  | 977
Ending balance | 4,887 | 6,274 | 4,887 | 6,274
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 |  | 4,703 |  | 5,826
Total gains or (losses) (realized/unrealized) Included in earnings |  | (272) |  | (1,395)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss) |  |  |  |
Purchases, issuances and settlements |  |  |  |
Transfer in and/or (out) of Level 3 |  |  |  |
Ending balance |  | 4,431 |  | 4,431
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] | Foreign Corporate Securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance fixed maturities |  | 4,703 |  | 5,826
Total gains or (losses) (realized/unrealized) Included in earnings |  | (272) |  | (1,395)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss) |  |  |  |
Purchases, issuances and settlements |  |  |  |
Transfer in and/or (out) of Level 3 |  |  |  |
Ending balance |  | 4,431 |  | 4,431
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 |  |  |  |

X
- 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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