Quarterly report pursuant to Section 13 or 15(d)

Derivatives And Fair Value (Narrative) (Details)

v3.7.0.1
Derivatives And Fair Value (Narrative) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
$ / Boe
bbl
Dec. 31, 2016
USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative, Nonmonetary Notional Amount, Volume | bbl 540,000  
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member]    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Underlying, Derivative Energy Measure | $ / Boe 49.63  
Prepayments and other [Member] | Not Designated as Hedging Instrument [Member] | Commodity Contract [Member]    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative instruments | $ $ 1,047 $ 1,227