Fair Value Measurements (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets (Liabilities)
Oil derivatives and basis swaps		$ 0
Natural gas derivatives		(15,239)
Total	$ 53,053
Fair value on a recurring basis
Assets (Liabilities)
Oil derivatives and basis swaps	49,562	(16,429)
Natural gas derivatives	284	1,190
Total	49,846	(15,239)
Fair value on a recurring basis \| Level 1
Assets (Liabilities)
Oil derivatives and basis swaps		0
Natural gas derivatives	0	0
Fair value on a recurring basis \| Level 2
Assets (Liabilities)
Oil derivatives and basis swaps	49,562	(16,429)
Natural gas derivatives	284	1,190
Total	49,846	(15,239)
Fair value on a recurring basis \| Level 3
Assets (Liabilities)
Oil derivatives and basis swaps		0
Natural gas derivatives	$ 0	$ 0

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

Name:	us-gaap_DerivativeLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant