Fair Value Measurements (Assets and Liabilities Measured on Recurring Basis) (Details) - Recurring - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Assets and liabilities measured at fair value on a recurring basis
Commodity derivatives, net	$ 51,666	$ 88,248	$ 95,357
Provisionally priced contracts	(56,853)	(174,079)	(35,590)
Convertible preferred securities	15,625	15,625	15,424
Other assets and liabilities	37,698	33,486	39,006
Total	48,136	(36,720)	114,197
Level 1
Assets and liabilities measured at fair value on a recurring basis
Commodity derivatives, net	50,587	48,676	69,833
Provisionally priced contracts	(40,720)	(108,736)	(19,061)
Convertible preferred securities	0	0	0
Other assets and liabilities	4,949	5,477	5,018
Total	14,816	(54,583)	55,790
Level 2
Assets and liabilities measured at fair value on a recurring basis
Commodity derivatives, net	1,079	39,572	25,524
Provisionally priced contracts	(16,133)	(65,343)	(16,529)
Convertible preferred securities	0	0	0
Other assets and liabilities	32,749	28,009	33,988
Total	17,695	2,238	42,983
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	15,625	15,625	15,424
Other assets and liabilities	0	0	0
Total	$ 15,625	$ 15,625	$ 15,424