Annual report pursuant to Section 13 and 15(d)

Derivatives and Fair Value (Narrative) (Details)

v3.20.1
Derivatives and Fair Value (Narrative) (Details)
$ in Millions
 12 Months Ended
May 06, 2019
$ / bbl
bbl
Dec. 31, 2019
USD ($)
bbl
Jun. 30, 2018
bbl
$ / bbl
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Barrels   274,870  
Benchmark of liability position, with required financial actions | $   $ 10.0  
Commodity Contract [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative assets | $   $ 0.6  
Quantity of barrels   274,870  
Commodity Contract, June 2018 Through June 2019 [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative, average price per barrel | $ / bbl     74.00
Quantity of barrels     400,000
Commodity Contract, July 19 Through June 2020 [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Derivative, average price per barrel | $ / bbl 66.70    
Barrels 500,000