Fair Value Measurements (Assets and Liabilities Measured on Recurring Basis) (Details) - Recurring - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024
Assets and liabilities measured at fair value on a recurring basis
Commodity derivatives, net	$ 71,030	$ 90,051	$ 51,666
Provisionally priced contracts	(17,802)	(57,220)	(56,853)
Convertible preferred securities	18,190	14,190	15,625
Other assets and liabilities	27,887	31,894	37,698
Total	99,305	78,915	48,136
Level 1
Assets and liabilities measured at fair value on a recurring basis
Commodity derivatives, net	40,995	47,721	50,587
Provisionally priced contracts	(6,317)	(12,203)	(40,720)
Convertible preferred securities	0	0	0
Other assets and liabilities	9,703	2,711	4,949
Total	44,381	38,229	14,816
Level 2
Assets and liabilities measured at fair value on a recurring basis
Commodity derivatives, net	30,035	42,330	1,079
Provisionally priced contracts	(11,485)	(45,017)	(16,133)
Convertible preferred securities	0	0	0
Other assets and liabilities	18,184	29,183	32,749
Total	36,734	26,496	17,695
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	15,625
Other assets and liabilities	0	0	0
Total	$ 18,190	$ 14,190	$ 15,625