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SEGMENT INFORMATION - Summary of Net Premiums Earned by Segment and Line of Business (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Information [Line Items] |  |  |
Net premiums earned | $ 5,306,235 | $ 5,083,781 | $ 5,160,326
Operating Segments |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 5,306,235 | 5,083,781 | 5,160,326
Operating Segments | Insurance |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 3,926,036 | 3,461,700 | 3,134,155
Operating Segments | Insurance | Professional lines |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 817,535 | 764,558 | 817,924
Operating Segments | Insurance | Property |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 1,139,308 | 878,849 | 755,986
Operating Segments | Insurance | Liability |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 494,561 | 496,381 | 459,775
Operating Segments | Insurance | Cyber |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 347,842 | 323,025 | 309,004
Operating Segments | Insurance | Marine and aviation |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 614,826 | 567,292 | 479,499
Operating Segments | Insurance | Accident and health |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 360,894 | 306,061 | 209,548
Operating Segments | Insurance | Credit and political risk |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 151,070 | 125,534 | 102,419
Operating Segments | Reinsurance |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 1,380,199 | 1,622,081 | 2,026,171
Operating Segments | Reinsurance | Run-off lines |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 32,445 | 91,996 | 322,339
Operating Segments | Reinsurance | Professional lines |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 169,074 | 205,404 | 250,911
Operating Segments | Reinsurance | Property | Run-off lines |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 6,266 | 44,508 | 135,480
Operating Segments | Reinsurance | Liability |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 309,265 | 403,239 | 484,681
Operating Segments | Reinsurance | Marine and aviation |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 64,609 | 65,658 | 78,504
Operating Segments | Reinsurance | Accident and health |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 322,932 | 341,806 | 368,747
Operating Segments | Reinsurance | Credit and surety |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 231,780 | 236,408 | 192,926
Operating Segments | Reinsurance | Motor |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 123,545 | 155,942 | 205,774
Operating Segments | Reinsurance | Agriculture |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 126,549 | 121,628 | 122,289
Operating Segments | Reinsurance | Catastrophe | Run-off lines |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 13,412 | 33,963 | 156,232
Operating Segments | Reinsurance | Engineering | Run-off lines |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | $ 12,767 | $ 13,525 | $ 30,627

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- Definition Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column E)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477965/944-235-S99-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479032/944-605-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(c)) -SubTopic 220 -Topic 942 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -SubTopic 220 -Topic 944 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 + Details
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