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Fair Value Measurements (Assets and Liabilities Measured on Recurring Basis) (Details) - Recurring - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Assets and liabilities measured at fair value on a recurring basis      
Commodity derivatives, net $ 88,105 $ 90,051 $ 38,549
Provisionally priced contracts (71,701) (57,220) (54,814)
Convertible preferred securities 18,190 14,190 15,725
Other assets and liabilities 25,083 31,894 26,507
Total 59,677 78,915 25,967
Level 1      
Assets and liabilities measured at fair value on a recurring basis      
Commodity derivatives, net 49,305 47,721 39,142
Provisionally priced contracts (38,570) (12,203) (24,870)
Convertible preferred securities 0 0 0
Other assets and liabilities 8,566 2,711 6,226
Total 19,301 38,229 20,498
Level 2      
Assets and liabilities measured at fair value on a recurring basis      
Commodity derivatives, net 38,800 42,330 (593)
Provisionally priced contracts (33,131) (45,017) (29,944)
Convertible preferred securities 0 0 0
Other assets and liabilities 16,517 29,183 20,281
Total 22,186 26,496 (10,256)
Level 3      
Assets and liabilities measured at fair value on a recurring basis      
Commodity derivatives, net 0 0 0
Provisionally priced contracts 0 0 0
Convertible preferred securities 18,190 14,190 15,725
Other assets and liabilities 0 0 0
Total $ 18,190 $ 14,190 $ 15,725