Subsequent Events (Details) - 16-Year Fixed Fee Natural Gas Transportation Agreement - Eddy County - Subsequent Event - USD ($) $ in Millions	1 Months Ended
Apr. 30, 2018	May 02, 2018
Subsequent Event [Line Items]
Agreement term	16 years
Contractual obligation	$ 4.8	$ 56.8

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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Period Type:	duration