Derivatives (Gross Current and Noncurrent Assets and Liabilities) (Details) - Commodity - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Derivatives, Fair Value [Line Items]
Commodity derivative assets	$ 220,585	$ 210,919	$ 302,559
Commodity derivative liabilities	(137,435)	(147,110)	(196,740)
Cash collateral paid	33,199
Cash collateral paid		24,439	9,075
Total	116,349	88,248	114,894
Commodity Derivative Assets - Current
Derivatives, Fair Value [Line Items]
Commodity derivative assets	200,835	201,542	284,879
Commodity derivative liabilities	(53,722)	(47,898)	(71,918)
Cash collateral paid	31,510
Cash collateral paid		24,439	9,075
Derivative assets	178,623	178,083	222,036
Commodity Derivative Assets - Noncurrent
Derivatives, Fair Value [Line Items]
Commodity derivative assets	9,764	1,496	4,175
Commodity derivative liabilities	(165)	(64)	(1,024)
Cash collateral paid	0
Cash collateral paid		0	0
Derivative assets	9,599	1,432	3,151
Commodity Derivative Liabilities - Current
Derivatives, Fair Value [Line Items]
Commodity derivative assets	9,879	7,868	13,431
Commodity derivative liabilities	(78,647)	(98,717)	(121,414)
Cash collateral paid	1,689
Cash collateral paid		0	0
Derivative Liability	(67,079)	(90,849)	(107,983)
Commodity Derivative Liabilities - Noncurrent
Derivatives, Fair Value [Line Items]
Commodity derivative assets	107	13	74
Commodity derivative liabilities	(4,901)	(431)	(2,384)
Cash collateral paid	0
Cash collateral paid		0	0
Derivative Liability	$ (4,794)	$ (418)	$ (2,310)