3.24.3 html 231 294 1 false 76 0 false 5 false false R1.htm 0000001 - Document - Cover Sheet http://www.greenlightre.ky/role/Cover Cover Cover 1 false false R2.htm 9952151 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS Sheet http://www.greenlightre.ky/role/CONDENSEDCONSOLIDATEDBALANCESHEETS CONDENSED CONSOLIDATED BALANCE SHEETS Statements 2 false false R3.htm 9952152 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) Sheet http://www.greenlightre.ky/role/CONDENSEDCONSOLIDATEDBALANCESHEETSParenthetical CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) Statements 3 false false R4.htm 9952153 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS Sheet http://www.greenlightre.ky/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATIONS CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS Statements 4 false false R5.htm 9952155 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS??? EQUITY Sheet http://www.greenlightre.ky/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCHANGESINSHAREHOLDERSEQUITY CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS??? EQUITY Statements 5 false false R6.htm 9952156 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Sheet http://www.greenlightre.ky/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOWS CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Statements 6 false false R7.htm 9952157 - Disclosure - ORGANIZATION AND BASIS OF PRESENTATION Sheet http://www.greenlightre.ky/role/ORGANIZATIONANDBASISOFPRESENTATION ORGANIZATION AND BASIS OF PRESENTATION Notes 7 false false R8.htm 9952158 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES Sheet http://www.greenlightre.ky/role/SIGNIFICANTACCOUNTINGPOLICIES SIGNIFICANT ACCOUNTING POLICIES Notes 8 false false R9.htm 9952159 - Disclosure - INVESTMENT IN RELATED PARTY INVESTMENT FUND Sheet http://www.greenlightre.ky/role/INVESTMENTINRELATEDPARTYINVESTMENTFUND INVESTMENT IN RELATED PARTY INVESTMENT FUND Notes 9 false false R10.htm 9952160 - Disclosure - OTHER INVESTMENTS Sheet http://www.greenlightre.ky/role/OTHERINVESTMENTS OTHER INVESTMENTS Notes 10 false false R11.htm 9952161 - Disclosure - RESTRICTED CASH AND CASH EQUIVALENTS Sheet http://www.greenlightre.ky/role/RESTRICTEDCASHANDCASHEQUIVALENTS RESTRICTED CASH AND CASH EQUIVALENTS Notes 11 false false R12.htm 9952162 - Disclosure - FAIR VALUE MEASUREMENTS Sheet http://www.greenlightre.ky/role/FAIRVALUEMEASUREMENTS FAIR VALUE MEASUREMENTS Notes 12 false false R13.htm 9952163 - Disclosure - LOSS AND LOSS ADJUSTMENT EXPENSE RESERVES Sheet http://www.greenlightre.ky/role/LOSSANDLOSSADJUSTMENTEXPENSERESERVES LOSS AND LOSS ADJUSTMENT EXPENSE RESERVES Notes 13 false false R14.htm 9952164 - Disclosure - RETROCESSION Sheet http://www.greenlightre.ky/role/RETROCESSION RETROCESSION Notes 14 false false R15.htm 9952165 - Disclosure - DEBT AND CREDIT FACILITIES Sheet http://www.greenlightre.ky/role/DEBTANDCREDITFACILITIES DEBT AND CREDIT FACILITIES Notes 15 false false R16.htm 9952166 - Disclosure - SHARE CAPITAL Sheet http://www.greenlightre.ky/role/SHARECAPITAL SHARE CAPITAL Notes 16 false false R17.htm 9952167 - Disclosure - SHARE-BASED COMPENSATION Sheet http://www.greenlightre.ky/role/SHAREBASEDCOMPENSATION SHARE-BASED COMPENSATION Notes 17 false false R18.htm 9952168 - Disclosure - EARNINGS PER SHARE Sheet http://www.greenlightre.ky/role/EARNINGSPERSHARE EARNINGS PER SHARE Notes 18 false false R19.htm 9952169 - Disclosure - NET INVESTMENT INCOME Sheet http://www.greenlightre.ky/role/NETINVESTMENTINCOME NET INVESTMENT INCOME Notes 19 false false R20.htm 9952170 - Disclosure - RELATED PARTY TRANSACTIONS Sheet http://www.greenlightre.ky/role/RELATEDPARTYTRANSACTIONS RELATED PARTY TRANSACTIONS Notes 20 false false R21.htm 9952171 - Disclosure - COMMITMENTS AND CONTINGENCIES Sheet http://www.greenlightre.ky/role/COMMITMENTSANDCONTINGENCIES COMMITMENTS AND CONTINGENCIES Notes 21 false false R22.htm 9952172 - Disclosure - SEGMENT REPORTING Sheet http://www.greenlightre.ky/role/SEGMENTREPORTING SEGMENT REPORTING Notes 22 false false R23.htm 9952173 - Disclosure - SUBSEQUENT EVENTS Sheet http://www.greenlightre.ky/role/SUBSEQUENTEVENTS SUBSEQUENT EVENTS Notes 23 false false R24.htm 995410 - Disclosure - Pay vs Performance Disclosure Sheet http://xbrl.sec.gov/ecd/role/PvpDisclosure Pay vs Performance Disclosure Notes 24 false false R25.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 25 false false R26.htm 9954471 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (Policies) Sheet http://www.greenlightre.ky/role/SIGNIFICANTACCOUNTINGPOLICIESPolicies SIGNIFICANT ACCOUNTING POLICIES (Policies) Policies 26 false false R27.htm 9954472 - Disclosure - INVESTMENT IN RELATED PARTY INVESTMENT FUND (Tables) Sheet http://www.greenlightre.ky/role/INVESTMENTINRELATEDPARTYINVESTMENTFUNDTables INVESTMENT IN RELATED PARTY INVESTMENT FUND (Tables) Tables http://www.greenlightre.ky/role/INVESTMENTINRELATEDPARTYINVESTMENTFUND 27 false false R28.htm 9954473 - Disclosure - OTHER INVESTMENTS (Tables) Sheet http://www.greenlightre.ky/role/OTHERINVESTMENTSTables OTHER INVESTMENTS (Tables) Tables http://www.greenlightre.ky/role/OTHERINVESTMENTS 28 false false R29.htm 9954474 - Disclosure - RESTRICTED CASH AND CASH EQUIVALENTS (Tables) Sheet http://www.greenlightre.ky/role/RESTRICTEDCASHANDCASHEQUIVALENTSTables RESTRICTED CASH AND CASH EQUIVALENTS (Tables) Tables http://www.greenlightre.ky/role/RESTRICTEDCASHANDCASHEQUIVALENTS 29 false false R30.htm 9954475 - Disclosure - FAIR VALUE MEASUREMENTS (Tables) Sheet http://www.greenlightre.ky/role/FAIRVALUEMEASUREMENTSTables FAIR VALUE MEASUREMENTS (Tables) Tables http://www.greenlightre.ky/role/FAIRVALUEMEASUREMENTS 30 false false R31.htm 9954476 - Disclosure - LOSS AND LOSS ADJUSTMENT EXPENSE RESERVES (Tables) Sheet http://www.greenlightre.ky/role/LOSSANDLOSSADJUSTMENTEXPENSERESERVESTables LOSS AND LOSS ADJUSTMENT EXPENSE RESERVES (Tables) Tables http://www.greenlightre.ky/role/LOSSANDLOSSADJUSTMENTEXPENSERESERVES 31 false false R32.htm 9954477 - Disclosure - RETROCESSION (Tables) Sheet http://www.greenlightre.ky/role/RETROCESSIONTables RETROCESSION (Tables) Tables http://www.greenlightre.ky/role/RETROCESSION 32 false false R33.htm 9954478 - Disclosure - DEBT AND CREDIT FACILITIES (Tables) Sheet http://www.greenlightre.ky/role/DEBTANDCREDITFACILITIESTables DEBT AND CREDIT FACILITIES (Tables) Tables http://www.greenlightre.ky/role/DEBTANDCREDITFACILITIES 33 false false R34.htm 9954479 - Disclosure - SHARE CAPITAL (Tables) Sheet http://www.greenlightre.ky/role/SHARECAPITALTables SHARE CAPITAL (Tables) Tables http://www.greenlightre.ky/role/SHARECAPITAL 34 false false R35.htm 9954480 - Disclosure - SHARE-BASED COMPENSATION (Tables) Sheet http://www.greenlightre.ky/role/SHAREBASEDCOMPENSATIONTables SHARE-BASED COMPENSATION (Tables) Tables http://www.greenlightre.ky/role/SHAREBASEDCOMPENSATION 35 false false R36.htm 9954481 - Disclosure - EARNINGS PER SHARE (Tables) Sheet http://www.greenlightre.ky/role/EARNINGSPERSHARETables EARNINGS PER SHARE (Tables) Tables http://www.greenlightre.ky/role/EARNINGSPERSHARE 36 false false R37.htm 9954482 - Disclosure - NET INVESTMENT INCOME (Tables) Sheet http://www.greenlightre.ky/role/NETINVESTMENTINCOMETables NET INVESTMENT INCOME (Tables) Tables http://www.greenlightre.ky/role/NETINVESTMENTINCOME 37 false false R38.htm 9954483 - Disclosure - COMMITMENTS AND CONTINGENCIES (Tables) Sheet http://www.greenlightre.ky/role/COMMITMENTSANDCONTINGENCIESTables COMMITMENTS AND CONTINGENCIES (Tables) Tables http://www.greenlightre.ky/role/COMMITMENTSANDCONTINGENCIES 38 false false R39.htm 9954484 - Disclosure - SEGMENT REPORTING (Tables) Sheet http://www.greenlightre.ky/role/SEGMENTREPORTINGTables SEGMENT REPORTING (Tables) Tables http://www.greenlightre.ky/role/SEGMENTREPORTING 39 false false R40.htm 9954485 - Disclosure - INVESTMENT IN RELATED PARTY INVESTMENT FUND - Narrative (Details) Sheet http://www.greenlightre.ky/role/INVESTMENTINRELATEDPARTYINVESTMENTFUNDNarrativeDetails INVESTMENT IN RELATED PARTY INVESTMENT FUND - Narrative (Details) Details 40 false false R41.htm 9954486 - Disclosure - INVESTMENT IN RELATED PARTY INVESTMENT FUND - Financial Information of Investment (Details) Sheet http://www.greenlightre.ky/role/INVESTMENTINRELATEDPARTYINVESTMENTFUNDFinancialInformationofInvestmentDetails INVESTMENT IN RELATED PARTY INVESTMENT FUND - Financial Information of Investment (Details) Details 41 false false R42.htm 9954487 - Disclosure - INVESTMENT IN RELATED PARTY INVESTMENT FUND - Summarized Statements of Assets, Liabilities and Net Assets of SILP (Details) Sheet http://www.greenlightre.ky/role/INVESTMENTINRELATEDPARTYINVESTMENTFUNDSummarizedStatementsofAssetsLiabilitiesandNetAssetsofSILPDetails INVESTMENT IN RELATED PARTY INVESTMENT FUND - Summarized Statements of Assets, Liabilities and Net Assets of SILP (Details) Details 42 false false R43.htm 9954488 - Disclosure - OTHER INVESTMENTS - Other Investments (Details) Sheet http://www.greenlightre.ky/role/OTHERINVESTMENTSOtherInvestmentsDetails OTHER INVESTMENTS - Other Investments (Details) Details 43 false false R44.htm 9954489 - Disclosure - OTHER INVESTMENTS - Nonrecurring Fair Value Disclosures (Details) Sheet http://www.greenlightre.ky/role/OTHERINVESTMENTSNonrecurringFairValueDisclosuresDetails OTHER INVESTMENTS - Nonrecurring Fair Value Disclosures (Details) Details 44 false false R45.htm 9954490 - Disclosure - OTHER INVESTMENTS - Net Investment Income (Loss) (Details) Sheet http://www.greenlightre.ky/role/OTHERINVESTMENTSNetInvestmentIncomeLossDetails OTHER INVESTMENTS - Net Investment Income (Loss) (Details) Details 45 false false R46.htm 9954491 - Disclosure - OTHER INVESTMENTS - Narrative (Details) Sheet http://www.greenlightre.ky/role/OTHERINVESTMENTSNarrativeDetails OTHER INVESTMENTS - Narrative (Details) Details 46 false false R47.htm 9954492 - Disclosure - RESTRICTED CASH AND CASH EQUIVALENTS (Details) Sheet http://www.greenlightre.ky/role/RESTRICTEDCASHANDCASHEQUIVALENTSDetails RESTRICTED CASH AND CASH EQUIVALENTS (Details) Details http://www.greenlightre.ky/role/RESTRICTEDCASHANDCASHEQUIVALENTSTables 47 false false R48.htm 9954493 - Disclosure - FAIR VALUE MEASUREMENTS - Narrative (Details) Sheet http://www.greenlightre.ky/role/FAIRVALUEMEASUREMENTSNarrativeDetails FAIR VALUE MEASUREMENTS - Narrative (Details) Details 48 false false R49.htm 9954494 - Disclosure - FAIR VALUE MEASUREMENTS - Assets Measured at Fair Value On a Nonrecurring Basis (Details) Sheet http://www.greenlightre.ky/role/FAIRVALUEMEASUREMENTSAssetsMeasuredatFairValueOnaNonrecurringBasisDetails FAIR VALUE MEASUREMENTS - Assets Measured at Fair Value On a Nonrecurring Basis (Details) Details 49 false false R50.htm 9954495 - Disclosure - LOSS AND LOSS ADJUSTMENT EXPENSE RESERVES - Liability for Unpaid Claims and Claims Adjustment Expense (Details) Sheet http://www.greenlightre.ky/role/LOSSANDLOSSADJUSTMENTEXPENSERESERVESLiabilityforUnpaidClaimsandClaimsAdjustmentExpenseDetails LOSS AND LOSS ADJUSTMENT EXPENSE RESERVES - Liability for Unpaid Claims and Claims Adjustment Expense (Details) Details 50 false false R51.htm 9954496 - Disclosure - LOSS AND LOSS ADJUSTMENT EXPENSE RESERVES - Narrative (Details) Sheet http://www.greenlightre.ky/role/LOSSANDLOSSADJUSTMENTEXPENSERESERVESNarrativeDetails LOSS AND LOSS ADJUSTMENT EXPENSE RESERVES - Narrative (Details) Details 51 false false R52.htm 9954497 - Disclosure - RETROCESSION - Ceded Reinsurance (Details) Sheet http://www.greenlightre.ky/role/RETROCESSIONCededReinsuranceDetails RETROCESSION - Ceded Reinsurance (Details) Details 52 false false R53.htm 9954498 - Disclosure - RETROCESSION - Breakdown of Losses Recoverable on a Gross and Net of Collateral Basis (Details) Sheet http://www.greenlightre.ky/role/RETROCESSIONBreakdownofLossesRecoverableonaGrossandNetofCollateralBasisDetails RETROCESSION - Breakdown of Losses Recoverable on a Gross and Net of Collateral Basis (Details) Details 53 false false R54.htm 9954499 - Disclosure - RETROCESSION - Narrative (Details) Sheet http://www.greenlightre.ky/role/RETROCESSIONNarrativeDetails RETROCESSION - Narrative (Details) Details 54 false false R55.htm 9954500 - Disclosure - DEBT AND CREDIT FACILITIES - Debt Obligations (Details) Sheet http://www.greenlightre.ky/role/DEBTANDCREDITFACILITIESDebtObligationsDetails DEBT AND CREDIT FACILITIES - Debt Obligations (Details) Details 55 false false R56.htm 9954501 - Disclosure - DEBT AND CREDIT FACILITIES - Narrative (Details) Sheet http://www.greenlightre.ky/role/DEBTANDCREDITFACILITIESNarrativeDetails DEBT AND CREDIT FACILITIES - Narrative (Details) Details 56 false false R57.htm 9954502 - Disclosure - DEBT AND CREDIT FACILITIES - Letter of Credit (???LOC???) Facilities (Details) Sheet http://www.greenlightre.ky/role/DEBTANDCREDITFACILITIESLetterofCreditLOCFacilitiesDetails DEBT AND CREDIT FACILITIES - Letter of Credit (???LOC???) Facilities (Details) Details 57 false false R58.htm 9954503 - Disclosure - SHARE CAPITAL - Stock by Class (Details) Sheet http://www.greenlightre.ky/role/SHARECAPITALStockbyClassDetails SHARE CAPITAL - Stock by Class (Details) Details 58 false false R59.htm 9954504 - Disclosure - SHARE CAPITAL - Narrative (Details) Sheet http://www.greenlightre.ky/role/SHARECAPITALNarrativeDetails SHARE CAPITAL - Narrative (Details) Details 59 false false R60.htm 9954505 - Disclosure - SHARE-BASED COMPENSATION - Restricted Stock (Details) Sheet http://www.greenlightre.ky/role/SHAREBASEDCOMPENSATIONRestrictedStockDetails SHARE-BASED COMPENSATION - Restricted Stock (Details) Details 60 false false R61.htm 9954506 - Disclosure - SHARE-BASED COMPENSATION - Narrative (Details) Sheet http://www.greenlightre.ky/role/SHAREBASEDCOMPENSATIONNarrativeDetails SHARE-BASED COMPENSATION - Narrative (Details) Details 61 false false R62.htm 9954507 - Disclosure - SHARE-BASED COMPENSATION - Restricted Stock Units (Details) Sheet http://www.greenlightre.ky/role/SHAREBASEDCOMPENSATIONRestrictedStockUnitsDetails SHARE-BASED COMPENSATION - Restricted Stock Units (Details) Details 62 false false R63.htm 9954508 - Disclosure - SHARE-BASED COMPENSATION - Schedule of Valuation Assumptions (Details) Sheet http://www.greenlightre.ky/role/SHAREBASEDCOMPENSATIONScheduleofValuationAssumptionsDetails SHARE-BASED COMPENSATION - Schedule of Valuation Assumptions (Details) Details 63 false false R64.htm 9954509 - Disclosure - EARNINGS PER SHARE (Details) Sheet http://www.greenlightre.ky/role/EARNINGSPERSHAREDetails EARNINGS PER SHARE (Details) Details http://www.greenlightre.ky/role/EARNINGSPERSHARETables 64 false false R65.htm 9954510 - Disclosure - NET INVESTMENT INCOME (Details) Sheet http://www.greenlightre.ky/role/NETINVESTMENTINCOMEDetails NET INVESTMENT INCOME (Details) Details http://www.greenlightre.ky/role/NETINVESTMENTINCOMETables 65 false false R66.htm 9954511 - Disclosure - RELATED PARTY TRANSACTIONS (Details) Sheet http://www.greenlightre.ky/role/RELATEDPARTYTRANSACTIONSDetails RELATED PARTY TRANSACTIONS (Details) Details http://www.greenlightre.ky/role/RELATEDPARTYTRANSACTIONS 66 false false R67.htm 9954512 - Disclosure - COMMITMENTS AND CONTINGENCIES - Breakdown of Reinsurance Balances Receivable (Details) Sheet http://www.greenlightre.ky/role/COMMITMENTSANDCONTINGENCIESBreakdownofReinsuranceBalancesReceivableDetails COMMITMENTS AND CONTINGENCIES - Breakdown of Reinsurance Balances Receivable (Details) Details 67 false false R68.htm 9954513 - Disclosure - SEGMENT REPORTING - Gross Premiums Written by Line of Business (Details) Sheet http://www.greenlightre.ky/role/SEGMENTREPORTINGGrossPremiumsWrittenbyLineofBusinessDetails SEGMENT REPORTING - Gross Premiums Written by Line of Business (Details) Details 68 false false R69.htm 9954514 - Disclosure - SEGMENT REPORTING - Gross Premiums Written by Geographic Area of Risks Insured (Details) Sheet http://www.greenlightre.ky/role/SEGMENTREPORTINGGrossPremiumsWrittenbyGeographicAreaofRisksInsuredDetails SEGMENT REPORTING - Gross Premiums Written by Geographic Area of Risks Insured (Details) Details 69 false false R70.htm 9954515 - Disclosure - SUBSEQUENT EVENTS (Details) Sheet http://www.greenlightre.ky/role/SUBSEQUENTEVENTSDetails SUBSEQUENT EVENTS (Details) Details http://www.greenlightre.ky/role/SUBSEQUENTEVENTS 70 false false All Reports Book All Reports glre-20240930.htm glre-20240930.xsd glre-20240930_cal.xml glre-20240930_def.xml glre-20240930_lab.xml glre-20240930_pre.xml http://fasb.org/srt/2024 http://fasb.org/us-gaap/2024 http://xbrl.sec.gov/dei/2024 http://xbrl.sec.gov/ecd/2024 true true