Quarterly report pursuant to Section 13 or 15(d)

Derivatives And Fair Value (Narrative) (Details)

v3.10.0.1
Derivatives And Fair Value (Narrative) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
$ / Boe
Sep. 30, 2018
USD ($)
bbl
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative instruments | $ $ 2.1 $ 2.1
Benchmark of liability position, with required financial actions | $ $ 10.0 $ 10.0
Underlying, Derivative Energy Measure | $ / Boe 74  
June 2018 Through June 2019 [Member]    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative, Nonmonetary Notional Amount, Volume | bbl   400,000
Commodity Swaps [Member]    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative, Nonmonetary Notional Amount, Volume | bbl   285,000