Fair Value Measurements (Fair value Hierarchy of Financial Assets and Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Oil derivative contracts – current	$ 36,809	$ 15,517
Oil derivative contracts – long-term	1,269	0
Total Assets	38,078	15,517
Oil derivative contracts – current	0	(13,018)
Total Liabilities		(13,018)
Quoted Prices in Active Markets (Level 1)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Oil derivative contracts – current	0	0
Oil derivative contracts – long-term	0
Total Assets	0	0
Oil derivative contracts – current		0
Total Liabilities		0
Significant Other Observable Inputs (Level 2)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Oil derivative contracts – current	36,809	15,517
Oil derivative contracts – long-term	1,269
Total Assets	38,078	15,517
Oil derivative contracts – current		(13,018)
Total Liabilities		(13,018)
Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Oil derivative contracts – current	0	0
Oil derivative contracts – long-term	0
Total Assets	$ 0	0
Oil derivative contracts – current		0
Total Liabilities		$ 0