v3.26.1
Assets and Liabilities Measured at Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Investments:    
Equities and equity funds $ 196,300 $ 201,663
Debt securities 2,002 1,971
Investments 198,302 203,634
Commodity derivatives 19,256 42,880
Assets 217,558 246,514
Liabilities:    
Liabilities 53,453 53,471
Equity Funds    
Investments:    
Equities and equity funds 123,246 128,659
Corporate and government bonds    
Investments:    
Debt securities 2,002 1,971
Bond market funds    
Investments:    
Equities and equity funds 73,054 73,004
Interest rate swaps    
Liabilities:    
Derivative liability 19,689 22,031
Commodity derivatives    
Liabilities:    
Derivative liability 33,764 31,440
Fair Value, Inputs, Level 1    
Investments:    
Investments 198,302 203,634
Commodity derivatives 0 0
Assets 198,302 203,634
Liabilities:    
Liabilities 0 0
Fair Value, Inputs, Level 1 | Equity Funds    
Investments:    
Equities and equity funds 123,246 128,659
Fair Value, Inputs, Level 1 | Corporate and government bonds    
Investments:    
Debt securities 2,002 1,971
Fair Value, Inputs, Level 1 | Bond market funds    
Investments:    
Equities and equity funds 73,054 73,004
Fair Value, Inputs, Level 1 | Interest rate swaps    
Liabilities:    
Derivative liability 0 0
Fair Value, Inputs, Level 1 | Commodity derivatives    
Liabilities:    
Derivative liability 0 0
Fair Value, Inputs, Level 2    
Investments:    
Investments 0 0
Commodity derivatives 19,256 42,880
Assets 19,256 42,880
Liabilities:    
Liabilities 53,453 53,471
Fair Value, Inputs, Level 2 | Equity Funds    
Investments:    
Equities and equity funds 0 0
Fair Value, Inputs, Level 2 | Corporate and government bonds    
Investments:    
Debt securities 0 0
Fair Value, Inputs, Level 2 | Bond market funds    
Investments:    
Equities and equity funds 0 0
Fair Value, Inputs, Level 2 | Interest rate swaps    
Liabilities:    
Derivative liability 19,689 22,031
Fair Value, Inputs, Level 2 | Commodity derivatives    
Liabilities:    
Derivative liability 33,764 31,440
Fair Value, Inputs, Level 3    
Investments:    
Investments 0 0
Commodity derivatives 0 0
Assets 0 0
Liabilities:    
Liabilities 0 0
Fair Value, Inputs, Level 3 | Equity Funds    
Investments:    
Equities and equity funds 0 0
Fair Value, Inputs, Level 3 | Corporate and government bonds    
Investments:    
Debt securities 0 0
Fair Value, Inputs, Level 3 | Bond market funds    
Investments:    
Equities and equity funds 0 0
Fair Value, Inputs, Level 3 | Interest rate swaps    
Liabilities:    
Derivative liability 0 0
Fair Value, Inputs, Level 3 | Commodity derivatives    
Liabilities:    
Derivative liability $ 0 $ 0