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SEGMENT INFORMATION - Summary of Net Premiums Earned by Segment and Line of Business (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Segment Information [Line Items] |  |  |
Net premiums earned | $ 5,160,326 | $ 4,709,850 | $ 4,371,309
Operating Segments |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 5,160,326 | 4,709,850 | 4,371,309
Operating Segments | Insurance |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 3,134,155 | 2,651,339 | 2,299,038
Operating Segments | Insurance | Professional lines |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 817,924 | 646,390 | 509,448
Operating Segments | Insurance | Property |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 755,986 | 711,297 | 653,186
Operating Segments | Insurance | Liability |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 459,775 | 354,787 | 315,434
Operating Segments | Insurance | Cyber |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 309,004 | 252,077 | 206,720
Operating Segments | Insurance | Marine and aviation |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 479,499 | 439,050 | 364,656
Operating Segments | Insurance | Accident and health |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 209,548 | 151,133 | 143,725
Operating Segments | Insurance | Credit and political risk |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 102,419 | 96,605 | 105,869
Operating Segments | Reinsurance |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 2,026,171 | 2,058,511 | 2,072,271
Operating Segments | Reinsurance | Run Off Lines |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 322,339 | 498,105 | 561,779
Operating Segments | Reinsurance | Professional lines |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 250,911 | 220,448 | 207,605
Operating Segments | Reinsurance | Property | Run Off Lines |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 135,480 | 231,092 | 256,324
Operating Segments | Reinsurance | Liability |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 484,681 | 431,596 | 397,894
Operating Segments | Reinsurance | Marine and aviation |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 78,504 | 58,775 | 53,513
Operating Segments | Reinsurance | Accident and health |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 368,747 | 361,196 | 333,997
Operating Segments | Reinsurance | Credit and surety |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 192,926 | 158,549 | 187,722
Operating Segments | Reinsurance | Motor |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 205,774 | 247,099 | 256,064
Operating Segments | Reinsurance | Agriculture |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 122,289 | 82,743 | 73,697
Operating Segments | Reinsurance | Catastrophe | Run Off Lines |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | 156,232 | 238,775 | 244,934
Operating Segments | Reinsurance | Engineering | Run Off Lines |  |  |
Segment Information [Line Items] |  |  |
Net premiums earned | $ 30,627 | $ 28,238 | $ 60,521

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column E)) -URI https://asc.fasb.org/extlink&oid=120401096&loc=d3e574992-122915 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(c)) -URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI https://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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