Fair Value Measurements (Fair Value Hierarchy Table) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Oil derivative contracts - current assets	$ 2,829	$ 0
Oil derivative contracts - long-term assets	2,071	0
Total Assets	4,900
Oil derivative contracts - current liabilities	(162,551)	(134,509)
Oil derivative contracts - long-term liabilities	(5,415)	0
Total Liabilities	(167,966)	(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	2,829
Oil derivative contracts - long-term assets	2,071
Total Assets	4,900
Oil derivative contracts - current liabilities	(162,551)	(134,509)
Oil derivative contracts - long-term liabilities	(5,415)
Total Liabilities	(167,966)	(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

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