Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Name:	us-gaap_AccountsReceivableNetCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Revenue Recognition - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue receivable	$ 3,848	$ 6,364
Oil production
Disaggregation of Revenue [Line Items]
Revenue receivable	900
Natural gas production
Disaggregation of Revenue [Line Items]
Revenue receivable	2,300
Natural gas liquids production
Disaggregation of Revenue [Line Items]
Revenue receivable	$ 600
Minimum
Disaggregation of Revenue [Line Items]
Revenue recognized, period	1 month
Maximum
Disaggregation of Revenue [Line Items]
Revenue recognized, period	2 months