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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, 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