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Investments - Schedule of Securities in Unrealized Loss Position (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	$ 2,115,232	$ 839,581
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses	(202,843)	(10,309)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value	124,695	70,909
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses	(25,655)	(3,561)
Fixed Maturities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	2,114,395	764,334
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses	(202,843)	(10,305)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value	124,695	70,909
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses	(25,655)	(3,561)
Short-Term Investments
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	837	75,247
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses		(4)
U.S. Government and Agencies [Member] | Fixed Maturities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	28,438	24,928
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses	(614)	(45)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value	1,472	1,557
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses	(104)	(34)
U.S. Government and Agencies [Member] | Short-Term Investments
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	837	34,967
Foreign Government [Member] | Fixed Maturities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	122,160	18,894
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses	(7,938)	(384)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value	6,517	3,335
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses	(2,317)	(211)
Foreign Government [Member] | Short-Term Investments
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value		4,995
States and Political Subdivisions [Member] | Fixed Maturities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	113,680	15,909
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses	(14,386)	(254)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value	969
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses	(71)
States and Political Subdivisions [Member] | Short-Term Investments
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value		11,394
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses		(1)
Corporates [Member] | Fixed Maturities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	1,192,279	341,963
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses	(117,546)	(5,035)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value	81,221	59,414
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses	(19,323)	(3,033)
Corporates [Member] | Short-Term Investments
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value		23,891
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses		(3)
Residential Mortgage-backed Securities [Member] | Fixed Maturities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	393,787	234,911
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses	(42,970)	(3,131)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value	22,195	2,707
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses	(2,703)	(99)
Commercial Mortgage-backed Securities [Member] | Fixed Maturities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	126,131	47,220
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses	(9,235)	(419)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value	8,004	117
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses	(626)	(1)
Other Asset-backed Securities [Member] | Fixed Maturities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, continuous unrealized loss position, less than 12 months, fair value	137,920	80,509
Available-for-sale securities, continuous unrealized loss position, less than 12 months, aggregate losses	(10,154)	(1,037)
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, fair value	4,317	3,779
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate losses	$ (511)	$ (183)

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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