DEBT AND CREDIT FACILITIES - Narrative (Details)			12 Months Ended
DEBT AND CREDIT FACILITIES - Narrative (Details)	Sep. 03, 2025 USD ($)	Jun. 16, 2023 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2025 GBP (£)	Oct. 09, 2025 USD ($)	Oct. 09, 2025 GBP (£)	Dec. 19, 2024 USD ($)	Dec. 17, 2024 USD ($)	Dec. 22, 2023 USD ($)
Debt Instrument [Line Items]
Proceeds from lines of credit			$ 0	$ 0	$ 75,000,000
Citibank
Debt Instrument [Line Items]
Capacity									$ 275,000,000
Term Loan
Debt Instrument [Line Items]
Capacity	$ 50,000,000
Term Loan \| Senior Notes
Debt Instrument [Line Items]
Repayments of lines of credit			10,300,000	13,800,000
Senior Unsecured Convertible Notes \| Senior Notes
Debt Instrument [Line Items]
Recognized interest expense			4,400,000	$ 5,800,000	$ 5,300,000
Revolving Credit Facility \| Line of Credit
Debt Instrument [Line Items]
Repayments of lines of credit			45,000,000
Revolving Credit Facility \| Amended Credit Agreement \| Line of Credit
Debt Instrument [Line Items]
Capacity	$ 50,000,000
Debt instrument, basis spread on variable rate	3.25%
Collateral amount			10,000,000.0
New Term Loan Facility
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		3.50%
Proceeds from lines of credit		$ 75,000,000.0
Debt instrument, amortization rate, percentage		5.00%
Line of credit facility, collateral fees, amount		$ 10,000,000.0
Financial Standby Letter of Credit
Debt Instrument [Line Items]
Capacity			575,000,000
LCs issued			310,423,000
Financial Standby Letter of Credit \| HSBC
Debt Instrument [Line Items]
Capacity			100,000,000
LCs issued			0
Financial Standby Letter of Credit \| Citibank
Debt Instrument [Line Items]
Capacity			275,000,000
LCs issued			173,618,000
Financial Standby Letter of Credit \| CIBC
Debt Instrument [Line Items]
Capacity			$ 200,000,000								$ 200,000,000.0
Extension period			1 year
Termination period			120 days
LCs issued			$ 136,805,000
Financial Standby Letter of Credit \| Citibank FAL
Debt Instrument [Line Items]
Capacity \| £						£ 50,000,000
LCs issued \| £						45,000,000
Letter of Credit \| HSBC
Debt Instrument [Line Items]
Capacity										$ 100,000,000
Letter of Credit \| Citibank FAL
Debt Instrument [Line Items]
Capacity \| £						£ 50,000,000
LCs issued							$ 60,700,000	£ 45,000,000
Unsecured Financial Standby Letter Of Credit \| CIBC
Debt Instrument [Line Items]
Capacity											$ 30,000,000.0

GREENLIGHT CAPITAL RE, LTD. 10-K