Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	5 Months Ended	6 Months Ended
Feb. 08, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Disaggregation of revenue by product	$ 6,657	$ 13,958	$ 21,561	$ 22,440	$ 46,478
Oil production
Disaggregation of Revenue [Line Items]
Disaggregation of revenue by product	1,502	3,858	5,660	6,041	11,982
Natural gas production
Disaggregation of Revenue [Line Items]
Disaggregation of revenue by product	4,130	8,224	11,825	13,233	26,709
Natural gas liquids production
Disaggregation of Revenue [Line Items]
Disaggregation of revenue by product	$ 1,025	$ 1,876	$ 4,076	$ 3,166	$ 7,788

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Name:	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration