Subsequent Events, Derivative Instruments (Schedule of Natural Gas Derivative Positions) (Details) - 2Q 2020 - Basis Swaps - Subsequent Event [Member] - Natural Gas	Apr. 05, 2019 MMBTU / d $ / MMBTU
Derivative [Line Items]
Derivative, Volumes (in MMBtu/d) \| MMBTU / d	15,000
Derivative, Swap Type, Average Fixed Price \| $ / MMBTU	(1.25)

Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

Name:	invest_DerivativeNonmonetaryNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant