Derivative And Financial Instruments (Effect On Statement Of Operations) (Details) - Commodity derivatives $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Derivative Instruments Gain Loss [Line Items]
Net gain (loss)	$ 3,901
Oil
Derivative Instruments Gain Loss [Line Items]
Net gain (loss)	3,814
Natural Gas
Derivative Instruments Gain Loss [Line Items]
Net gain (loss)	$ 87