Derivatives (Gross Current and Noncurrent Assets and Liabilities) (Details) - Commodity - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022
Derivatives, Fair Value [Line Items]
Commodity derivative assets	$ 468,557	$ 346,670	$ 752,967
Commodity derivative liabilities	(357,910)	(213,282)	(368,925)
Cash collateral (received) paid	(15,290)
Cash collateral (received) paid		64,530	70,442
Total	95,357	197,918	454,484
Commodity Derivative Assets - Current
Derivatives, Fair Value [Line Items]
Commodity derivative assets	438,227	325,762	707,542
Commodity derivative liabilities	(75,253)	(94,704)	(138,627)
Cash collateral (received) paid	(15,290)
Cash collateral (received) paid		64,530	69,442
Derivative assets	347,684	295,588	638,357
Commodity Derivative Assets - Noncurrent
Derivatives, Fair Value [Line Items]
Commodity derivative assets	3,959	1,796	14,257
Commodity derivative liabilities	(1,029)	(149)	(2,132)
Cash collateral (received) paid	0
Cash collateral (received) paid		0	0
Derivative assets	2,930	1,647	12,125
Commodity Derivative Liabilities - Current
Derivatives, Fair Value [Line Items]
Commodity derivative assets	26,312	18,426	29,223
Commodity derivative liabilities	(277,413)	(116,945)	(216,126)
Cash collateral (received) paid	0
Cash collateral (received) paid		0	1,000
Derivative Liability	(251,101)	(98,519)	(185,903)
Commodity Derivative Liabilities - Noncurrent
Derivatives, Fair Value [Line Items]
Commodity derivative assets	59	686	1,945
Commodity derivative liabilities	(4,215)	(1,484)	(12,040)
Cash collateral (received) paid	0
Cash collateral (received) paid		0	0
Derivative Liability	$ (4,156)	$ (798)	$ (10,095)