FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value of Financial Instruments That Are Not Carried at Fair Value on a Recurring Basis (Details) - Nonrecurring - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 185,943	$ 177,851
Other Long Term Investments	215,363	183,741
Mortgage Loans	38,621	38,879
Total Assets Measured at Fair Value	439,927	400,471
Long Term Debt	142,638	108,353
Total	142,638	108,353
Limited Liability Company
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Long Term Investments	97,300
Lloyd's Syndicate Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Long Term Investments	116,600
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	181,955	177,851
Other Long Term Investments	0	0
Mortgage Loans	0	0
Total Assets Measured at Fair Value	181,955	177,851
Long Term Debt	0	0
Total	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	3,988	0
Other Long Term Investments	1,409	1,277
Mortgage Loans	0	0
Total Assets Measured at Fair Value	5,397	1,277
Long Term Debt	142,638	108,353
Total	142,638	108,353
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Other Long Term Investments	0	0
Mortgage Loans	38,621	38,879
Total Assets Measured at Fair Value	38,621	38,879
Long Term Debt	0	0
Total	0	0
Net Asset Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Other Long Term Investments	213,954	182,464
Mortgage Loans	0	0
Total Assets Measured at Fair Value	213,954	182,464
Long Term Debt	0	0
Total	$ 0	$ 0