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Fair Value Measurements (Assets and Liabilities Measured on Recurring Basis) (Details) - Recurring - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Assets and liabilities measured at fair value on a recurring basis      
Commodity derivatives, net $ 95,357 $ 197,918 $ 454,484
Provisionally priced contracts (35,590) (136,337) 10,116
Convertible preferred securities 15,424 16,278 16,803
Other assets and liabilities 39,006 31,191 19,420
Total 114,197 109,050 500,823
Level 1      
Assets and liabilities measured at fair value on a recurring basis      
Commodity derivatives, net 69,833 54,516 235,665
Provisionally priced contracts (19,061) (20,960) 38,061
Convertible preferred securities 0 0 0
Other assets and liabilities 5,018 (209) 1,097
Total 55,790 33,347 274,823
Level 2      
Assets and liabilities measured at fair value on a recurring basis      
Commodity derivatives, net 25,524 143,402 218,819
Provisionally priced contracts (16,529) (115,377) (27,945)
Convertible preferred securities 0 0 0
Other assets and liabilities 33,988 31,400 18,323
Total 42,983 59,425 209,197
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 15,424 16,278 16,803
Other assets and liabilities 0 0 0
Total $ 15,424 $ 16,278 $ 16,803