v3.26.1
INVESTMENTS - Equity Securities (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Debt and Equity Securities, FV-NI [Line Items]    
Cost $ 606,505 $ 581,275
Gross unrealized gains 181,094 153,468
Gross unrealized losses (39,067) (27,174)
Fair value 748,532 707,569
Common stocks    
Debt and Equity Securities, FV-NI [Line Items]    
Cost 3,545 13,927
Gross unrealized gains 366 439
Gross unrealized losses (626) (671)
Fair value 3,285 13,695
Preferred stocks    
Debt and Equity Securities, FV-NI [Line Items]    
Cost 45,293 19,662
Gross unrealized gains 3,976 717
Gross unrealized losses (428) (68)
Fair value 48,841 20,311
Exchange-traded funds    
Debt and Equity Securities, FV-NI [Line Items]    
Cost 268,849 259,353
Gross unrealized gains 169,242 142,901
Gross unrealized losses (2,956) (497)
Fair value 435,135 401,757
Bond mutual funds    
Debt and Equity Securities, FV-NI [Line Items]    
Cost 288,818 288,333
Gross unrealized gains 7,510 9,411
Gross unrealized losses (35,057) (25,938)
Fair value $ 261,271 $ 271,806