Fair Value Measurements (Assets and Liabilities Measured on Recurring Basis) (Details) - Recurring - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Assets and liabilities measured at fair value on a recurring basis
Commodity derivatives, net	$ 114,894	$ 197,918	$ 563,597
Provisionally priced contracts	(68,337)	(136,337)	4,807
Convertible preferred securities	15,410	16,278	15,905
Other assets and liabilities	33,340	31,191	14,109
Total	95,307	109,050	598,418
Level 1
Assets and liabilities measured at fair value on a recurring basis
Commodity derivatives, net	32,115	54,516	264,806
Provisionally priced contracts	(16,187)	(20,960)	47,505
Convertible preferred securities	0	0	0
Other assets and liabilities	8,357	(209)	4,677
Total	24,285	33,347	316,988
Level 2
Assets and liabilities measured at fair value on a recurring basis
Commodity derivatives, net	82,779	143,402	298,791
Provisionally priced contracts	(52,150)	(115,377)	(42,698)
Convertible preferred securities	0	0	0
Other assets and liabilities	24,983	31,400	9,432
Total	55,612	59,425	265,525
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	15,410	16,278	15,905
Other assets and liabilities	0	0	0
Total	$ 15,410	$ 16,278	$ 15,905