Derivative Financial Instruments (Gas Derivative Contracts Volume And Weighted Average Price) (Details)	2 Months Ended	12 Months Ended
	Feb. 18, 2020 MMBTU / d $ / MMBTU	Dec. 31, 2019 MMBTU / d $ / MMBTU
Swap Contracts For First Quarter of Year One [Member] | Gas contracts, in MMBTU
Derivative [Line Items]
Volume per day (Bbl) | MMBTU / d		0
Swap Contracts For First Quarter of Year One [Member] | Gas contracts, price per MMBTU
Derivative [Line Items]
Price per MMBtu in usd | $ / MMBTU		0
Swap Contracts For Second Quarter of Year One [Member] | Gas contracts, in MMBTU
Derivative [Line Items]
Volume per day (Bbl) | MMBTU / d		30,000
Swap Contracts For Second Quarter of Year One [Member] | Gas contracts, price per MMBTU
Derivative [Line Items]
Price per MMBtu in usd | $ / MMBTU		2.41
Swap Contracts For Third Quarter of Year One [Member] | Gas contracts, in MMBTU
Derivative [Line Items]
Volume per day (Bbl) | MMBTU / d		30,000
Swap Contracts For Third Quarter of Year One [Member] | Gas contracts, price per MMBTU
Derivative [Line Items]
Price per MMBtu in usd | $ / MMBTU		2.41
Swap contracts for next year Q4 | Gas contracts, in MMBTU
Derivative [Line Items]
Volume per day (Bbl) | MMBTU / d		10,109
Swap contracts for next year Q4 | Gas contracts, price per MMBTU
Derivative [Line Items]
Price per MMBtu in usd | $ / MMBTU		2.41
Basis swap contracts for next year Q1 | Gas contracts, in MMBTU | Permian Basin
Derivative [Line Items]
Volume per day (Bbl) | MMBTU / d		0
Basis swap contracts for next year Q1 | Gas contracts, price per MMBTU | Permian Basin
Derivative [Line Items]
Price differential, dollars per barrel | $ / MMBTU		0
Basis swap contracts for next year Q2 | Gas contracts, in MMBTU | Permian Basin
Derivative [Line Items]
Volume per day (Bbl) | MMBTU / d		30,000
Basis swap contracts for next year Q2 | Gas contracts, price per MMBTU | Permian Basin
Derivative [Line Items]
Price differential, dollars per barrel | $ / MMBTU		(1.68)
Basis swap contracts for next year Q3 | Gas contracts, in MMBTU | Permian Basin
Derivative [Line Items]
Volume per day (Bbl) | MMBTU / d		30,000
Basis swap contracts for next year Q3 | Gas contracts, price per MMBTU | Permian Basin
Derivative [Line Items]
Price differential, dollars per barrel | $ / MMBTU		(1.68)
Basis swap contracts for next year Q4 | Gas contracts, in MMBTU | Permian Basin
Derivative [Line Items]
Volume per day (Bbl) | MMBTU / d		10,109
Basis swap contracts for next year Q4 | Gas contracts, price per MMBTU | Permian Basin
Derivative [Line Items]
Price differential, dollars per barrel | $ / MMBTU		(1.68)
Swap Contracts For November 2020 Through March 2021 [Member] | Gas contracts, in MMBTU | Subsequent event
Derivative [Line Items]
Volume per day (Bbl) | MMBTU / d	10,000
Price per MMBtu in usd | $ / MMBTU	2.46
Swap Contracts For November 2020 Through March 2021 [Member] | Gas contracts, in MMBTU | Permian Basin | Subsequent event
Derivative [Line Items]
Volume per day (Bbl) | MMBTU / d	10,000
Price differential, dollars per barrel | $ / MMBTU	1.46