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Intangible Assets - Schedule of Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross $ 194,093 $ 194,093
Finite-Lived Intangible Assets, Accumulated Amortization (105,753) (101,181)
Intangible assets, net 88,340 92,912
Wholesale Fuel Supply Contracts/Rights [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 187,643 187,643
Finite-Lived Intangible Assets, Accumulated Amortization (100,223) (95,694)
Intangible assets, net 87,420 91,949
Trademarks/Licenses [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 1,898 1,898
Finite-Lived Intangible Assets, Accumulated Amortization (1,128) (1,115)
Intangible assets, net 770 783
Covenant Not to Compete [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 4,552 4,552
Finite-Lived Intangible Assets, Accumulated Amortization (4,402) (4,372)
Intangible assets, net $ 150 $ 180