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Sale and Disposition of Assets (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
location
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
location
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Sale and Disposition of Assets          
Other $ 7 $ (175) $ (96) $ 32  
Net loss (gain) on sale and disposition of assets $ (811) (1,128) $ (68) (575)  
Number of sites classified as held for sale | location 1   1    
Assets held for sale $ 200   $ 200   $ 4,600
Gasoline Distribution and Station Operations Segment          
Sale and Disposition of Assets          
Goodwill derecognized     585    
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]          
Sale and Disposition of Assets          
Loss on assets held-for-sale 0 480 406 1,265  
Periodic Divestiture Of Gasoline Stations (Member) | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]          
Sale and Disposition of Assets          
(Gain) loss on sale and divestitures (650)   (278) (142)  
Periodic Divestiture Of Gasoline Stations (Member) | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Gasoline Distribution and Station Operations Segment          
Sale and Disposition of Assets          
(Gain) loss on sale and divestitures $ (600) 0 $ (300) (100)  
Strategic Asset Divestiture Program (Member)          
Sale and Disposition of Assets          
Number of locations divested | location 2   3    
Strategic Asset Divestiture Program (Member) | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]          
Sale and Disposition of Assets          
Gain/loss on strategic asset sale $ 168 1,433 $ 100 $ 1,730  
Loss on asset divestitures, income statement location     us-gaap:GainLossOnDispositionOfAssets1 us-gaap:GainLossOnDispositionOfAssets1  
Goodwill derecognized $ 500 $ 1,300 $ 600 $ 2,200