Derivative Financial Instruments Additional Information (Details) MMBTU in Thousands	Sep. 30, 2016 MMBTU MBbls
Derivatives in Place for Anticipated Production
Anticipated natural gas production hedged (MMBtu) \| MMBTU	90,425
Anticipated crude oil production hedged (MBbls) \| MBbls	8,857

The quantity of future oil and gas production being hedged.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 360
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 12.D.3(b))
-URI http://asc.fasb.org/extlink&oid=27015634&loc=d3e516453-122869

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 12
-Section D
-Paragraph b
-Subsection 3

Name:	us-gaap_PortionOfFutureOilAndGasProductionBeingHedged
Namespace Prefix:	us-gaap_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	instant