Fair Value Measurements (Fair value Hierarchy of Financial Assets and Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Oil derivative contracts – current	$ 23,554	$ 15,517
Oil derivative contracts – long-term	1,617	0
Total Assets	25,171	15,517
Oil derivative contracts – current	(1,613)	(13,018)
Total Liabilities	(1,613)	(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	0
Total Liabilities	0	0
Significant Other Observable Inputs (Level 2)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Oil derivative contracts – current	23,554	15,517
Oil derivative contracts – long-term	1,617
Total Assets	25,171	15,517
Oil derivative contracts – current	(1,613)	(13,018)
Total Liabilities	(1,613)	(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	0
Total Liabilities	$ 0	$ 0