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Long-Term Obligations - DKL Credit Facility (Details) - USD ($)
1 Months Ended 6 Months Ended
May 26, 2022
Aug. 31, 2020
Jun. 30, 2022
Jun. 30, 2021
Sep. 28, 2018
Line of Credit Facility [Line Items]          
Net increase (decrease) in cash and cash equivalents     $ 9,518,000 $ (2,070,000)  
Line of Credit | Revolving Credit Facility | Fifth Third Bank          
Line of Credit Facility [Line Items]          
Weighted average interest rate (as percent)     3.35%    
Line of Credit | Revolving Credit Facility | Fifth Third Bank | Prime Rate | United States of America, Dollars          
Line of Credit Facility [Line Items]          
Variable rate description     U.S. dollar prime rate    
Line of Credit | Revolving Credit Facility | Fifth Third Bank | Canadian prime rate | Canada, Dollars          
Line of Credit Facility [Line Items]          
Variable rate description     Canadian dollar prime rate    
Line of Credit | Revolving Credit Facility | Fifth Third Bank | Canadian Dealer Offered Rate (CDOR) | Canada, Dollars          
Line of Credit Facility [Line Items]          
Variable rate description     Canadian Dealer Offered Rate    
Line of Credit | Revolving Credit Facility | Fifth Third Bank | Secured Overnight Financing Rate (SOFR) | United States of America, Dollars          
Line of Credit Facility [Line Items]          
Variable rate description     Secured Overnight Financing Rate    
DKL Revolver | Line of Credit | Revolving Credit Facility | Fifth Third Bank          
Line of Credit Facility [Line Items]          
Maximum lender commitment $ 1,000,000,000       $ 850,000,000
Maximum amount under accordion feature         $ 1,000,000,000
Net increase (decrease) in cash and cash equivalents   $ 20,000,000      
Increase in line of credit facility 150,000,000        
DKL Revolver | Line of Credit | US LC Sublimit | Fifth Third Bank          
Line of Credit Facility [Line Items]          
Maximum lender commitment 90,000,000        
DKL Revolver | Line of Credit | US Swing Line Sublimit | Fifth Third Bank          
Line of Credit Facility [Line Items]          
Maximum lender commitment $ 18,000,000        
Second Amended and Restated Credit Agreement | Line of Credit | Revolving Credit Facility | Fifth Third Bank          
Line of Credit Facility [Line Items]          
Commitment fee (as percent)     0.30%    
Outstanding borrowings     $ 880,900,000    
Letters of credit outstanding     0    
Unused credit commitment     $ 119,100,000