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Intangible Assets - Schedule of Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross $ 185,426 $ 194,093
Finite-Lived Intangible Assets, Accumulated Amortization (99,856) (101,181)
Intangible assets, net 85,570 92,912
Wholesale Fuel Supply Contracts/Rights [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 183,078 187,643
Finite-Lived Intangible Assets, Accumulated Amortization (98,392) (95,694)
Intangible assets, net 84,686 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 (1,142) (1,115)
Intangible assets, net 756 783
Covenant Not to Compete [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 450 4,552
Finite-Lived Intangible Assets, Accumulated Amortization (322) (4,372)
Intangible assets, net $ 128 $ 180