Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - WTL Oil Acquisition (Narrative) (Details)

v3.19.2
Acquisitions - WTL Oil Acquisition (Narrative) (Details) - WTL Oil LLC - USD ($)
$ in Millions
12 Months Ended
May 31, 2018
Dec. 31, 2018
Business Acquisition [Line Items]    
Purchase price $ 6.1  
Acquisition related costs   $ 0.1