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Long-Term Debt (Narrative) (Details) - USD ($)
12 Months Ended
Apr. 01, 2020
Aug. 27, 2019
Dec. 31, 2020
Sep. 13, 2019
Aug. 31, 2019
Apr. 25, 2017
Debt Instrument [Line Items]            
Fixed charge coverage ratio     0.90      
Fixed charge coverage ratio threshold, percentage of aggregate facility commitments and borrowing base     17.50%      
Fixed charge coverage ratio threshold, amount of aggregate facility commitments and borrowing base     $ 70,000,000      
Secured debt to EBITDA ratio     0.29      
Shortfall of net income and retained earnings     $ 82,700,000      
Minimum            
Debt Instrument [Line Items]            
Fixed charge coverage ratio     1.0      
Period for fixed charge coverage ratio threshold (in days)     3 days      
Dividend restriction threshold as amount of availability     $ 100,000,000      
Dividend restriction threshold as a percentage of revolving commitments and borrowing base     25.00%      
Maximum            
Debt Instrument [Line Items]            
Secured debt to EBITDA ratio     4.5      
Dividend restriction threshold as a percentage of revolving commitments and borrowing base with consideration of fixed charge coverage ratio     40.00%      
Federal Funds Rate            
Debt Instrument [Line Items]            
Spread over variable rate (percent)     0.50%      
LIBOR            
Debt Instrument [Line Items]            
Spread over variable rate (percent)     1.00%      
Cash            
Debt Instrument [Line Items]            
Percentage of asset available to borrow against     100.00%      
Credit Card Receivables            
Debt Instrument [Line Items]            
Percentage of asset available to borrow against     90.00%      
Investment Grade Accounts            
Debt Instrument [Line Items]            
Percentage of asset available to borrow against     90.00%      
Other Accounts            
Debt Instrument [Line Items]            
Percentage of asset available to borrow against     85.00%      
Midstream Refined Products Inventory            
Debt Instrument [Line Items]            
Percentage of asset available to borrow against     80.00%      
Refined Retail Products Inventory            
Debt Instrument [Line Items]            
Percentage of asset available to borrow against     75.00%      
Retail Merchandise Inventory            
Debt Instrument [Line Items]            
Percentage of asset available to borrow against     70.00%      
Percentage of net orderly liquidation value available to borrow against     85.00%      
Secured Debt            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity         $ 325,000,000  
Secured Debt | LIBOR | Minimum            
Debt Instrument [Line Items]            
Spread over variable rate (percent)     1.50%      
Secured Debt | LIBOR | Maximum            
Debt Instrument [Line Items]            
Spread over variable rate (percent)     2.00%      
Secured Debt | Alternative Base Rate | Minimum            
Debt Instrument [Line Items]            
Spread over variable rate (percent)     0.50%      
Secured Debt | Alternative Base Rate | Maximum            
Debt Instrument [Line Items]            
Spread over variable rate (percent)     1.00%      
Term Loan            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity         200,000,000  
Proceeds from lines of credit   $ 200,000,000        
Debt instrument term   4 years        
Repayments of long-term debt   $ 57,000,000        
Additional term loan     $ 50,000,000      
Outstanding balance     $ 212,500,000      
Principal payment period $ 12,500,000          
Term Loan | LIBOR | Minimum            
Debt Instrument [Line Items]            
Spread over variable rate (percent)     2.50%      
Term Loan | LIBOR | Maximum            
Debt Instrument [Line Items]            
Spread over variable rate (percent)     2.75%      
Term Loan | Alternative Base Rate | Minimum            
Debt Instrument [Line Items]            
Spread over variable rate (percent)     1.50%      
Term Loan | Alternative Base Rate | Maximum            
Debt Instrument [Line Items]            
Spread over variable rate (percent)     1.75%      
Additional Term Loan Available Until December 2019            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity         50,000,000  
Incremental Facility            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity         150,000,000  
ABL Facility            
Debt Instrument [Line Items]            
Additional term loan     $ 100,000,000      
Outstanding under facility     $ 0      
Letter Of Credit            
Debt Instrument [Line Items]            
Line of credit facility, sublimit         $ 100,000,000  
Senior Notes | 5.625% senior notes due 2027            
Debt Instrument [Line Items]            
Senior notes           $ 300,000,000
Interest rate (percent)           5.625%
Senior Notes | Senior Notes 4.75 Percent Due 2029            
Debt Instrument [Line Items]            
Senior notes       $ 500,000,000    
Interest rate (percent)       4.75%