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SCHEDULE IV - SUPPLEMENTARY REINSURANCE INFORMATION (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Supplementary Insurance Information [Line Items] |  |  |
GROSS AMOUNT | $ 5,102,958 | $ 4,405,452 | $ 3,610,201
CEDED TO OTHER COMPANIES | 2,951,539 | 2,759,360 | 2,490,529
ASSUMED FROM OTHER COMPANIES | 3,111,637 | 3,280,532 | 3,216,737
Net | $ 5,263,056 | $ 4,926,624 | $ 4,336,409
PERCENTAGE OF AMOUNT ASSUMED TO NET | 59.10% | 66.60% | 74.20%
Property and Casualty |  |  |
Supplementary Insurance Information [Line Items] |  |  |
GROSS AMOUNT | $ 4,858,629 | $ 4,233,758 | $ 3,455,690
CEDED TO OTHER COMPANIES | 2,900,300 | 2,700,693 | 2,446,890
ASSUMED FROM OTHER COMPANIES | 2,685,677 | 2,874,687 | 2,840,834
Net | $ 4,644,006 | $ 4,407,752 | $ 3,849,634
PERCENTAGE OF AMOUNT ASSUMED TO NET | 57.80% | 65.20% | 73.80%
Accident and health |  |  |
Supplementary Insurance Information [Line Items] |  |  |
GROSS AMOUNT | $ 244,329 | $ 171,694 | $ 154,511
CEDED TO OTHER COMPANIES | 51,239 | 58,667 | 43,639
ASSUMED FROM OTHER COMPANIES | 425,960 | 405,845 | 375,903
Net | $ 619,050 | $ 518,872 | $ 486,775
PERCENTAGE OF AMOUNT ASSUMED TO NET | 68.80% | 78.20% | 77.20%

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- Definition Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums written. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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