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Litigation (Details)	Nov. 07, 2019
Subsequent Event
Business Combination
Loss Contingency, Number of Plaintiffs	3

[Line Items] for Business Combination [Table]

No definition available.

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Namespace Prefix:	ee_
Data Type:	xbrli:stringItemType
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Number of plaintiffs that have filed claims pertaining to a loss contingency.

No definition available.

Name:	us-gaap_LossContingencyNumberOfPlaintiffs
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: