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
Mar. 31, 2022	Mar. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities	$ 2,067,870	$ 1,330,224
Total gains or (losses) (realized/unrealized) Included in earnings	16,058	(5,954)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	(33,039)	(250)
Purchases, issuances and settlements	74,274	171,480
Transfer in and/or (out) of Level 3
Ending balance	2,125,163	1,495,500
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	318
Corporate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities	800,574	701,492
Total gains or (losses) (realized/unrealized) Included in earnings	15,943	(1,789)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	(4,167)	2,836
Purchases, issuances and settlements	(97,694)	2,003
Transfer in and/or (out) of Level 3
Ending balance	714,656	704,542
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	318
Asset Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities	1,251,281	623,033
Total gains or (losses) (realized/unrealized) Included in earnings	102	(4,168)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	(28,788)	(3,135)
Purchases, issuances and settlements	166,096	169,630
Transfer in and/or (out) of Level 3
Ending balance	1,388,691	785,360
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
CMBS [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)	(23)
Purchases, issuances and settlements	5,913
Transfer in and/or (out) of Level 3
Ending balance	5,890
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	16,015	5,699
Total gains or (losses) (realized/unrealized) Included in earnings	13	3
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	(61)	49
Purchases, issuances and settlements	(41)	(153)
Transfer in and/or (out) of Level 3
Ending balance	15,926	$ 5,599
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)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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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
-Topic 820
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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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-Name Accounting Standards Codification
-Topic 820
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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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