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Asset Exchange Transaction With Circle K - Additional Information (Details)
$ in Thousands
3 Months Ended 12 Months Ended
May 21, 2019
USD ($)
Store
Dec. 17, 2018
USD ($)
Store
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Store
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Feb. 25, 2020
USD ($)
Store
Nov. 18, 2019
Store
Sep. 05, 2019
USD ($)
Store
Business Acquisition [Line Items]                    
Properties aggregate fair value | $         $ 762,527 $ 841,146        
Proceeds from sale of assets | $         4,856 $ 6,642 $ 27,552      
Circle K Stores Inc. [Member]                    
Business Acquisition [Line Items]                    
Number of Stores                 47  
Proceeds from sale of assets | $         $ 3,148          
Number of operated sites         17          
Asset Exchange Agreement [Member]                    
Business Acquisition [Line Items]                    
Properties aggregate fair value | $   $ 184,500                
Asset Exchange Agreement [Member] | Subsequent Event [Member]                    
Business Acquisition [Line Items]                    
Properties aggregate fair value | $               $ 11,000    
Asset Exchange Agreement [Member] | Indemnification Obligations [Member]                    
Business Acquisition [Line Items]                    
Warranties and covenants period   18 months                
Maximum amount exempted from indemnification obligations | $   $ 1,845                
Maximum indemnification obligation | $   $ 39,900                
Asset Exchange Agreement [Member] | U.S. Upper Midwest [Member]                    
Business Acquisition [Line Items]                    
Number of convenience and fuel retail stores currently owned and operated   17                
Asset Exchange Agreement [Member] | CK Properties [Member] | Subsequent Event [Member]                    
Business Acquisition [Line Items]                    
Properties aggregate fair value | $               $ 10,300    
Asset Exchange Agreement [Member] | Circle K Stores Inc. [Member]                    
Business Acquisition [Line Items]                    
Number of Stores   192                
Expected period for closure of asset exchange agreement   24 months                
Asset Exchange Agreement [Member] | Circle K Stores Inc. [Member] | U.S. Upper Midwest [Member]                    
Business Acquisition [Line Items]                    
Number of convenience and fuel retail stores currently leased and operated   56                
Asset Exchange Agreement [Member] | Circle K Stores Inc. [Member] | Fee Site [Member]                    
Business Acquisition [Line Items]                    
Number of Stores   162                
Asset Exchange Agreement [Member] | Circle K Stores Inc. [Member] | Fee Site [Member] | Subsequent Event [Member]                    
Business Acquisition [Line Items]                    
Number of Stores               10    
Asset Exchange Agreement [Member] | Circle K Stores Inc. [Member] | Leased Site [Member]                    
Business Acquisition [Line Items]                    
Number of Stores   30                
Asset Exchange Agreement [Member] | Circle K Stores Inc. [Member] | Leased Site [Member] | Subsequent Event [Member]                    
Business Acquisition [Line Items]                    
Number of convenience and fuel retail stores currently owned and operated               5    
Asset Exchange Agreement [Member] | Circle K Stores Inc. [Member] | CK Properties [Member]                    
Business Acquisition [Line Items]                    
Properties aggregate fair value | $   $ 184,500                
First Asset Exchange [Member]                    
Business Acquisition [Line Items]                    
Properties aggregate fair value | $ $ 58,100                  
First Asset Exchange [Member] | CK Properties [Member]                    
Business Acquisition [Line Items]                    
Properties aggregate fair value | $ $ 58,300                  
First Asset Exchange [Member] | Circle K Stores Inc. [Member]                    
Business Acquisition [Line Items]                    
Number of Stores 60                  
Proceeds from sale of assets | $       $ 2,800            
First Asset Exchange [Member] | Circle K Stores Inc. [Member] | U.S. Upper Midwest [Member]                    
Business Acquisition [Line Items]                    
Number of convenience and fuel retail stores currently leased and operated 17                  
First Asset Exchange [Member] | Circle K Stores Inc. [Member] | Fee Site [Member]                    
Business Acquisition [Line Items]                    
Number of Stores 52                  
First Asset Exchange [Member] | Circle K Stores Inc. [Member] | Leased Site [Member]                    
Business Acquisition [Line Items]                    
Number of Stores 8                  
Second Asset Exchange [Member]                    
Business Acquisition [Line Items]                    
Properties aggregate fair value | $                   $ 50,200
Second Asset Exchange [Member] | CK Properties [Member]                    
Business Acquisition [Line Items]                    
Properties aggregate fair value | $                   $ 51,400
Second Asset Exchange [Member] | Circle K Stores Inc. [Member]                    
Business Acquisition [Line Items]                    
Number of Stores                   56
Proceeds from sale of assets | $     $ 300              
Second Asset Exchange [Member] | Circle K Stores Inc. [Member] | Fee Site [Member]                    
Business Acquisition [Line Items]                    
Number of Stores                   51
Second Asset Exchange [Member] | Circle K Stores Inc. [Member] | Leased Site [Member]                    
Business Acquisition [Line Items]                    
Number of convenience and fuel retail stores currently leased and operated                   19
Number of Stores                   5
Sub-Jobber Agreement [Member] | Circle K Stores Inc. [Member]                    
Business Acquisition [Line Items]                    
Agreement expire date May 21, 2024                  
Right to extend agreement term 180 days