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Long-Term Debt (Narrative) (Details) - USD ($)
12 Months Ended
Apr. 01, 2020
Sep. 13, 2019
Aug. 27, 2019
Dec. 31, 2019
Aug. 31, 2019
Apr. 25, 2017
Debt Instrument [Line Items]            
Fixed charge coverage ratio       0.93    
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       0.58    
Shortfall of net income and retained earnings       $ 30,600,000    
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      
Repayments of long-term debt     $ 57,000,000      
Additional term loan       $ 50,000,000    
Outstanding balance       $ 250,000,000    
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%    
ABL Facility            
Debt Instrument [Line Items]            
Additional term loan       $ 100,000,000    
Outstanding under facility       $ 0    
Additional Term Loan Available Until December 2019 [Member]            
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  
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%   5.625%
Senior Notes | 6.00% senior notes due 2023            
Debt Instrument [Line Items]            
Senior notes   $ 500,000,000        
Interest rate (percent)   6.00%   6.00%    
Repayments of long-term debt   $ 514,500,000        
Senior Notes | Senior Notes 4.75 Percent Due 2029            
Debt Instrument [Line Items]            
Senior notes   $ 500,000,000        
Interest rate (percent)   4.75%   4.75%    
Forecast | Term Loan            
Debt Instrument [Line Items]            
Principal payment period $ 12,500,000