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Investment Information - Aging of available for sale securities in an unrealized loss position (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Available for sale securities: |  |
Estimated Fair Value - Less than 12 Months | $ 12,975,400 | $ 12,238,683
Gross Unrealized Losses - Less than 12 Months | (927,531) | (157,279)
Estimated Fair Value - 12 Months or More | 5,671,580 | 297,357
Gross Unrealized Losses - 12 Months or More | (720,756) | (14,265)
Estimated Fair Value - Total | 18,646,980 | 12,536,040
Gross Unrealized Losses - Total | (1,648,287) | (171,544)
Fixed maturities available for sale, at fair value |  |
Available for sale securities: |  |
Estimated Fair Value - Less than 12 Months | 12,738,665 | 11,953,950
Gross Unrealized Losses - Less than 12 Months | (925,643) | (156,689)
Estimated Fair Value - 12 Months or More | 5,671,580 | 297,357
Gross Unrealized Losses - 12 Months or More | (720,756) | (14,265)
Estimated Fair Value - Total | 18,410,245 | 12,251,307
Gross Unrealized Losses - Total | (1,646,399) | (170,954)
Fixed maturities available for sale, at fair value | Corporate bonds |  |
Available for sale securities: |  |
Estimated Fair Value - Less than 12 Months | 4,822,624 | 3,639,582
Gross Unrealized Losses - Less than 12 Months | (393,112) | (63,938)
Estimated Fair Value - 12 Months or More | 2,559,399 | 98,867
Gross Unrealized Losses - 12 Months or More | (388,241) | (5,256)
Estimated Fair Value - Total | 7,382,023 | 3,738,449
Gross Unrealized Losses - Total | (781,353) | (69,194)
Fixed maturities available for sale, at fair value | Mortgage backed securities |  |
Available for sale securities: |  |
Estimated Fair Value - Less than 12 Months | 545,844 | 222,176
Gross Unrealized Losses - Less than 12 Months | (51,673) | (3,545)
Estimated Fair Value - 12 Months or More | 154,154 | 46,809
Gross Unrealized Losses - 12 Months or More | (34,914) | (1,865)
Estimated Fair Value - Total | 699,998 | 268,985
Gross Unrealized Losses - Total | (86,587) | (5,410)
Fixed maturities available for sale, at fair value | Municipal bonds |  |
Available for sale securities: |  |
Estimated Fair Value - Less than 12 Months | 363,936 | 26,665
Gross Unrealized Losses - Less than 12 Months | (29,924) | (385)
Estimated Fair Value - 12 Months or More | 16,282 | 16,361
Gross Unrealized Losses - 12 Months or More | (3,436) | (1,024)
Estimated Fair Value - Total | 380,218 | 43,026
Gross Unrealized Losses - Total | (33,360) | (1,409)
Fixed maturities available for sale, at fair value | Commercial mortgage backed securities |  |
Available for sale securities: |  |
Estimated Fair Value - Less than 12 Months | 598,392 | 675,603
Gross Unrealized Losses - Less than 12 Months | (34,899) | (2,805)
Estimated Fair Value - 12 Months or More | 445,175 | 5,908
Gross Unrealized Losses - 12 Months or More | (22,768) | (312)
Estimated Fair Value - Total | 1,043,567 | 681,511
Gross Unrealized Losses - Total | (57,667) | (3,117)
Fixed maturities available for sale, at fair value | US government and government agencies |  |
Available for sale securities: |  |
Estimated Fair Value - Less than 12 Months | 3,556,676 | 4,211,621
Gross Unrealized Losses - Less than 12 Months | (197,259) | (44,180)
Estimated Fair Value - 12 Months or More | 1,442,542 | 33,373
Gross Unrealized Losses - 12 Months or More | (145,704) | (1,787)
Estimated Fair Value - Total | 4,999,218 | 4,244,994
Gross Unrealized Losses - Total | (342,963) | (45,967)
Fixed maturities available for sale, at fair value | Non-US government securities |  |
Available for sale securities: |  |
Estimated Fair Value - Less than 12 Months | 1,702,973 | 1,511,301
Gross Unrealized Losses - Less than 12 Months | (153,587) | (31,983)
Estimated Fair Value - 12 Months or More | 541,652 | 62,957
Gross Unrealized Losses - 12 Months or More | (84,259) | (2,766)
Estimated Fair Value - Total | 2,244,625 | 1,574,258
Gross Unrealized Losses - Total | (237,846) | (34,749)
Fixed maturities available for sale, at fair value | Asset backed securities |  |
Available for sale securities: |  |
Estimated Fair Value - Less than 12 Months | 1,148,220 | 1,667,002
Gross Unrealized Losses - Less than 12 Months | (65,189) | (9,853)
Estimated Fair Value - 12 Months or More | 512,376 | 33,082
Gross Unrealized Losses - 12 Months or More | (41,434) | (1,255)
Estimated Fair Value - Total | 1,660,596 | 1,700,084
Gross Unrealized Losses - Total | (106,623) | (11,108)
Short-term investments |  |
Available for sale securities: |  |
Estimated Fair Value - Less than 12 Months | 236,735 | 284,733
Gross Unrealized Losses - Less than 12 Months | (1,888) | (590)
Estimated Fair Value - 12 Months or More | 0 | 0
Gross Unrealized Losses - 12 Months or More | 0 | 0
Estimated Fair Value - Total | 236,735 | 284,733
Gross Unrealized Losses - Total | $ (1,888) | $ (590)

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