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SEGMENT INFORMATION - Summary of Gross Premiums Written by Geographical Location of Subsidiaries (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written | $ 8,214,595 | $ 7,685,984 | $ 6,826,938
U.S. |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written | 4,342,707 | 4,002,748 | 3,398,108
Ireland |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written | 1,931,815 | 1,667,496 | 1,516,596
Lloyd's of London |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written | 1,567,458 | 1,473,047 | 1,309,802
Bermuda |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Gross premiums written | $ 372,615 | $ 542,693 | $ 602,432

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- Definition Amount of direct and assumed premiums written. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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