Fair Value Measurements (Assets and Liabilities Measured on Recurring Basis) (Details) - Recurring - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Assets and liabilities measured at fair value on a recurring basis
Commodity derivatives, net	$ 116,349	$ 88,248	$ 114,894
Provisionally priced contracts	(116,885)	(174,079)	(68,337)
Convertible preferred securities	15,625	15,625	15,410
Other assets and liabilities	38,385	33,486	33,340
Total	53,474	(36,720)	95,307
Level 1
Assets and liabilities measured at fair value on a recurring basis
Commodity derivatives, net	48,750	48,676	32,115
Provisionally priced contracts	(86,176)	(108,736)	(16,187)
Convertible preferred securities	0	0	0
Other assets and liabilities	5,525	5,477	8,357
Total	(31,901)	(54,583)	24,285
Level 2
Assets and liabilities measured at fair value on a recurring basis
Commodity derivatives, net	67,599	39,572	82,779
Provisionally priced contracts	(30,709)	(65,343)	(52,150)
Convertible preferred securities	0	0	0
Other assets and liabilities	32,860	28,009	24,983
Total	69,750	2,238	55,612
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	15,410
Other assets and liabilities	0	0	0
Total	$ 15,625	$ 15,625	$ 15,410