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Investments - Schedule of Available-for-sale Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale debt securities, at fair value | $ 2,554,465 | $ 2,702,567
Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale debt securities, amortized cost basis | 2,777,820 | 2,621,388
Available-for-sale debt securities gross unrealized gain | 5,143 | 95,045
Available-for-sale debt securities, gross unrealized loss | (228,498) | (13,866)
Available-for-sale debt securities, at fair value | 2,554,465 | 2,702,567
Short-Term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale debt securities, amortized cost basis | 3,311 | 85,246
Available-for-sale debt securities gross unrealized gain |  | 1
Available-for-sale debt securities, gross unrealized loss |  | (4)
Available-for-sale debt securities, at fair value | 3,311 | 85,243
Fixed-Maturity Securities and Short-term Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale debt securities, amortized cost basis | 2,781,131 | 2,706,634
Available-for-sale debt securities gross unrealized gain | 5,143 | 95,046
Available-for-sale debt securities, gross unrealized loss | (228,498) | (13,870)
Available-for-sale debt securities, at fair value | 2,557,776 | 2,787,810
U.S. Government and Agencies [Member] | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale debt securities, amortized cost basis | 32,924 | 32,292
Available-for-sale debt securities gross unrealized gain | 46 | 187
Available-for-sale debt securities, gross unrealized loss | (718) | (79)
Available-for-sale debt securities, at fair value | 32,252 | 32,400
Foreign Government [Member] | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale debt securities, amortized cost basis | 159,464 | 147,288
Available-for-sale debt securities gross unrealized gain | 623 | 6,283
Available-for-sale debt securities, gross unrealized loss | (10,255) | (595)
Available-for-sale debt securities, at fair value | 149,832 | 152,976
States and Political Subdivisions [Member] | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale debt securities, amortized cost basis | 143,750 | 147,455
Available-for-sale debt securities gross unrealized gain | 247 | 6,326
Available-for-sale debt securities, gross unrealized loss | (14,457) | (254)
Available-for-sale debt securities, at fair value | 129,540 | 153,527
Corporates [Member] | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale debt securities, amortized cost basis | 1,650,504 | 1,649,334
Available-for-sale debt securities gross unrealized gain | 3,338 | 72,418
Available-for-sale debt securities, gross unrealized loss | (136,869) | (8,068)
Available-for-sale debt securities, at fair value | 1,516,973 | 1,713,684
Residential Mortgage-backed Securities [Member] | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale debt securities, amortized cost basis | 484,034 | 373,753
Available-for-sale debt securities gross unrealized gain | 701 | 5,108
Available-for-sale debt securities, gross unrealized loss | (45,673) | (3,230)
Available-for-sale debt securities, at fair value | 439,062 | 375,631
Commercial Mortgage-backed Securities [Member] | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale debt securities, amortized cost basis | 145,360 | 142,631
Available-for-sale debt securities gross unrealized gain | 6 | 3,314
Available-for-sale debt securities, gross unrealized loss | (9,861) | (420)
Available-for-sale debt securities, at fair value | 135,505 | 145,525
Other Asset-backed Securities [Member] | Fixed Maturities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale debt securities, amortized cost basis | 161,784 | 128,635
Available-for-sale debt securities gross unrealized gain | 182 | 1,409
Available-for-sale debt securities, gross unrealized loss | (10,665) | (1,220)
Available-for-sale debt securities, at fair value | $ 151,301 | $ 128,824

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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