Annual report pursuant to Section 13 and 15(d)

Derivatives And Fair Value (Narrative) (Details)

v3.10.0.1
Derivatives And Fair Value (Narrative) (Details)
$ in Millions
Dec. 31, 2018
USD ($)
bbl
$ / bbl
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Benchmark of liability position, with required financial actions | $ $ 10.0
June 2018 Through June 2019 [Member]  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Quantity of barrels | bbl 400,000
Commodity Contract [Member]  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Quantity of barrels | bbl 172,000
Derivative instruments | $ $ 3.5
Commodity Contract [Member] | June 2018 Through June 2019 [Member]  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Derivative, average price per barrel | $ / bbl 74.00