Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - Recurring - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Assets and liabilities measured at fair value on a recurring basis
Commodity derivatives, net	$ 197,918	$ 285,105
Provisionally priced contracts	(136,337)	(45,853)
Convertible preferred securities	16,278	11,618
Other assets and liabilities	31,191	(4,577)
Total	109,050	246,293
Level 1
Assets and liabilities measured at fair value on a recurring basis
Commodity derivatives, net	54,516	128,407
Provisionally priced contracts	(20,960)	43,944
Convertible preferred securities	0	0
Other assets and liabilities	(209)	2,784
Total	33,347	175,135
Level 2
Assets and liabilities measured at fair value on a recurring basis
Commodity derivatives, net	143,402	156,698
Provisionally priced contracts	(115,377)	(89,797)
Convertible preferred securities	0	0
Other assets and liabilities	31,400	(7,361)
Total	59,425	59,540
Level 3
Assets and liabilities measured at fair value on a recurring basis
Commodity derivatives, net	0	0
Provisionally priced contracts	0	0
Convertible preferred securities	16,278	11,618
Other assets and liabilities	0	0
Total	$ 16,278	$ 11,618