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Subsidiary Bankruptcy and Deconsolidation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Apr. 25, 2017
Dec. 31, 2016
Subsidiary Bankruptcy and Deconsolidation [Line Items]            
Loss on deconsolidation of subsidiary (Note 3) $ 1,635 $ 0 $ 1,635 $ 0    
Accounts receivable – related party $ 417   $ 417     $ 0
Adams Resources Exploration Corporation [Member]            
Subsidiary Bankruptcy and Deconsolidation [Line Items]            
DIP financing amount         $ 1,250  
Adams Resources Exploration Corporation [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Subsidiary Bankruptcy and Deconsolidation [Line Items]            
DIP financing, interest rate 2.00%   2.00%      
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | AREC [Member]            
Subsidiary Bankruptcy and Deconsolidation [Line Items]            
Expected transaction price $ 5,000   $ 5,000      
Loss on deconsolidation of subsidiary (Note 3)     $ 1,600