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Fair Value Measurements (Assets and Liabilities Measured on Recurring Basis) (Details) - Recurring - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Assets and liabilities measured at fair value on a recurring basis      
Commodity derivatives, net $ 38,549 $ 88,248 $ 99,850
Provisionally priced contracts (54,814) (174,079) (105,117)
Convertible preferred securities 15,725 15,625 20,628
Other assets and liabilities 26,507 33,486 44,309
Total 25,967 (36,720) 59,670
Level 1      
Assets and liabilities measured at fair value on a recurring basis      
Commodity derivatives, net 39,142 48,676 54,324
Provisionally priced contracts (24,870) (108,736) (80,657)
Convertible preferred securities 0 0 0
Other assets and liabilities 6,226 5,477 2,331
Total 20,498 (54,583) (24,002)
Level 2      
Assets and liabilities measured at fair value on a recurring basis      
Commodity derivatives, net (593) 39,572 45,526
Provisionally priced contracts (29,944) (65,343) (24,460)
Convertible preferred securities 0 0 0
Other assets and liabilities 20,281 28,009 41,978
Total (10,256) 2,238 63,044
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 15,725 15,625 20,628
Other assets and liabilities 0 0 0
Total $ 15,725 $ 15,625 $ 20,628