Annual report pursuant to Section 13 and 15(d)

Supplemental Oil and Gas Disclosures - Schedule of Prices Weighted by Field Production Related to Proved Reserves (Details)

v3.8.0.1
Supplemental Oil and Gas Disclosures - Schedule of Prices Weighted by Field Production Related to Proved Reserves (Details)
 12 Months Ended
Dec. 31, 2017
$ / Boe
$ / Mcf
Dec. 31, 2016
$ / Boe
$ / Mcf
Dec. 31, 2015
$ / Boe
$ / Mcf
Dec. 31, 2014
$ / Boe
$ / Mcf
Oil        
Reserve Quantities [Line Items]        
Weighted price 46.58 36.28 46.94 91.12
NGLs        
Reserve Quantities [Line Items]        
Weighted price 22.65 16.82 17.60 34.63
Natural Gas        
Reserve Quantities [Line Items]        
Weighted price | $ / Mcf 2.86 2.47 2.50 4.27