Fair Value Measurements (Fair Value Hierarchy Table) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Oil derivative contracts - current assets	$ 26,782	$ 0
Oil derivative contracts - long-term assets	9,048	0
Total Assets	35,830
Oil derivative contracts - current liabilities	(33,868)	(134,509)
Oil derivative contracts - long-term liabilities	0
Total Liabilities	(33,868)	(134,509)
Quoted Prices in Active Markets (Level 1)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Oil derivative contracts - current assets	0
Oil derivative contracts - long-term assets	0
Total Assets	0
Oil derivative contracts - current liabilities	0	0
Oil derivative contracts - long-term liabilities	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 assets	26,782
Oil derivative contracts - long-term assets	9,048
Total Assets	35,830
Oil derivative contracts - current liabilities	(33,868)	(134,509)
Oil derivative contracts - long-term liabilities	0
Total Liabilities	(33,868)	(134,509)
Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Oil derivative contracts - current assets	0
Oil derivative contracts - long-term assets	0
Total Assets	0
Oil derivative contracts - current liabilities	0	0
Oil derivative contracts - long-term liabilities	0
Total Liabilities	$ 0	$ 0