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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Information [Line Items]      
Net premiums earned $ 5,083,781 $ 5,160,326 $ 4,709,850
Operating Segments      
Segment Information [Line Items]      
Net premiums earned 5,083,781 5,160,326 4,709,850
Operating Segments | Insurance      
Segment Information [Line Items]      
Net premiums earned 3,461,700 3,134,155 2,651,339
Operating Segments | Insurance | Professional lines      
Segment Information [Line Items]      
Net premiums earned 764,558 817,924 646,390
Operating Segments | Insurance | Property      
Segment Information [Line Items]      
Net premiums earned 878,849 755,986 711,297
Operating Segments | Insurance | Liability      
Segment Information [Line Items]      
Net premiums earned 496,381 459,775 354,787
Operating Segments | Insurance | Cyber      
Segment Information [Line Items]      
Net premiums earned 323,025 309,004 252,077
Operating Segments | Insurance | Marine and aviation      
Segment Information [Line Items]      
Net premiums earned 567,292 479,499 439,050
Operating Segments | Insurance | Accident and health      
Segment Information [Line Items]      
Net premiums earned 306,061 209,548 151,133
Operating Segments | Insurance | Credit and political risk      
Segment Information [Line Items]      
Net premiums earned 125,534 102,419 96,605
Operating Segments | Reinsurance      
Segment Information [Line Items]      
Net premiums earned 1,622,081 2,026,171 2,058,511
Operating Segments | Reinsurance | Run-off lines      
Segment Information [Line Items]      
Net premiums earned 91,996 322,339 498,105
Operating Segments | Reinsurance | Professional lines      
Segment Information [Line Items]      
Net premiums earned 205,404 250,911 220,448
Operating Segments | Reinsurance | Property | Run-off lines      
Segment Information [Line Items]      
Net premiums earned 44,508 135,480 231,092
Operating Segments | Reinsurance | Liability      
Segment Information [Line Items]      
Net premiums earned 403,239 484,681 431,596
Operating Segments | Reinsurance | Marine and aviation      
Segment Information [Line Items]      
Net premiums earned 65,658 78,504 58,775
Operating Segments | Reinsurance | Accident and health      
Segment Information [Line Items]      
Net premiums earned 341,806 368,747 361,196
Operating Segments | Reinsurance | Credit and surety      
Segment Information [Line Items]      
Net premiums earned 236,408 192,926 158,549
Operating Segments | Reinsurance | Motor      
Segment Information [Line Items]      
Net premiums earned 155,942 205,774 247,099
Operating Segments | Reinsurance | Agriculture      
Segment Information [Line Items]      
Net premiums earned 121,628 122,289 82,743
Operating Segments | Reinsurance | Catastrophe | Run-off lines      
Segment Information [Line Items]      
Net premiums earned 33,963 156,232 238,775
Operating Segments | Reinsurance | Engineering | Run-off lines      
Segment Information [Line Items]      
Net premiums earned $ 13,525 $ 30,627 $ 28,238