Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Assets and liabilities measured at fair value on a recurring basis
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Identifiable assets
Recurring
Assets and liabilities measured at fair value on a recurring basis
Commodity derivatives, net	$ 90,051	$ 88,248
Provisionally priced contracts	(57,220)	(174,079)
Convertible preferred securities	14,190	15,625
Other assets and liabilities	31,894	33,486
Total	78,915	(36,720)
Recurring | Level 1
Assets and liabilities measured at fair value on a recurring basis
Commodity derivatives, net	47,721	48,676
Provisionally priced contracts	(12,203)	(108,736)
Convertible preferred securities	0	0
Other assets and liabilities	2,711	5,477
Total	38,229	(54,583)
Recurring | Level 2
Assets and liabilities measured at fair value on a recurring basis
Commodity derivatives, net	42,330	39,572
Provisionally priced contracts	(45,017)	(65,343)
Convertible preferred securities	0	0
Other assets and liabilities	29,183	28,009
Total	26,496	2,238
Recurring | 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	14,190	15,625
Other assets and liabilities	0	0
Total	$ 14,190	$ 15,625