v3.26.1
Investments (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Available-for-sale debt securities:    
Cost $ 1,958 $ 1,947
Gross unrealized gain 44 24
Gross unrealized loss 0 0
Debt securities 2,002 1,971
Equity securities:    
Cost 122,640 120,724
Unrealized gain 79,899 86,512
Unrealized loss (6,239) (5,573)
Equity securities at fair value 196,300 201,663
Other Securities    
Cost 208 88
Unrealized loss 0 0
Unrealized gain 0 0
Other securities at fair value 208 88
Debt Securities, Equity, and Other Securities    
Cost 124,806 122,759
Unrealized gain 79,943 86,536
Unrealized loss (6,239) (5,573)
Fair value 198,510 203,722
Equity Funds    
Equity securities:    
Cost 43,347 42,147
Unrealized gain 79,899 86,512
Unrealized loss 0 0
Equity securities at fair value 123,246 128,659
Bond market funds    
Equity securities:    
Cost 79,293 78,577
Unrealized gain 0 0
Unrealized loss (6,239) (5,573)
Equity securities at fair value $ 73,054 $ 73,004