Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Pro Forma Information WTL Oil Acquisition (Details)

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Acquisitions - Pro Forma Information WTL Oil Acquisition (Details) - WTL Oil LLC - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Business Acquisition [Line Items]    
Revenues $ 595  
Net income 5  
Depreciation 100  
Revenues 3,354 $ 1,553
Net income $ 90 $ 62