Fair Value (Activity Under Level 3, Fair Value Measurements Using Significant Unobservable Inputs By Asset Type) (Details) - Market Value [Member] - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities	$ 2,125,163	$ 1,495,500	$ 2,067,870	$ 1,330,224
Total gains or (losses) (realized/unrealized) Included in earnings	(4,483)	(13,418)	11,575	(19,372)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	(54,151)	12,107	(87,190)	11,857
Purchases, issuances and settlements	96,947	31,545	171,221	203,025
Transfer in/(out) of Level 3 and reclassification of securities in/(out) of investment categories
Ending balance	2,163,476	1,525,734	2,163,476	1,525,734
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	2,418	(22,194)	2,736	(22,194)
Corporate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities	714,656	704,542	800,574	701,492
Total gains or (losses) (realized/unrealized) Included in earnings	(4,534)	(13,761)	11,409	(15,550)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	(3,003)	4,582	(7,170)	7,418
Purchases, issuances and settlements	27,750	10,208	(69,944)	12,211
Transfer in/(out) of Level 3 and reclassification of securities in/(out) of investment categories	127,558		127,558
Ending balance	862,427	705,571	862,427	705,571
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	(5,261)	(17,279)	(4,943)	(17,279)
Asset Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities	1,388,691	785,360	1,251,281	623,033
Total gains or (losses) (realized/unrealized) Included in earnings	35	206	137	(3,962)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	(47,202)	7,610	(75,990)	4,475
Purchases, issuances and settlements	61,565	22,100	227,661	191,730
Transfer in/(out) of Level 3 and reclassification of securities in/(out) of investment categories	(147,692)		(147,692)
Ending balance	1,255,397	815,276	1,255,397	815,276
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	7,679	(4,915)	7,679	(4,915)
CMBS [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities	5,890
Total gains or (losses) (realized/unrealized) Included in earnings
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	(199)		(222)
Purchases, issuances and settlements			5,913
Transfer in/(out) of Level 3 and reclassification of securities in/(out) of investment categories
Ending balance	5,691		5,691
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
Foreign Corporate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities	15,926	5,598	16,015	5,699
Total gains or (losses) (realized/unrealized) Included in earnings	16	137	29	140
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	(3,747)	(85)	(3,808)	(36)
Purchases, issuances and settlements	7,632	(763)	7,591	(916)
Transfer in/(out) of Level 3 and reclassification of securities in/(out) of investment categories	20,134		20,134
Ending balance	39,961	4,887	39,961	4,887
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

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.

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)
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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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-Publisher FASB
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Amount of purchases, (sales), issuances and (settlements) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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