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Long-Term Debt (Narrative) (Details)
9 Months Ended
Mar. 10, 2016
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Apr. 25, 2017
USD ($)
Mar. 31, 2016
USD ($)
Aug. 14, 2013
USD ($)
Debt Instrument [Line Items]            
Fixed charge coverage ratio   0.81        
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   0.19        
Dividend restrictions   The Senior Credit Agreement contains restrictions on certain payments, including dividends, when availability under the credit agreement is less than or equal to the greater of $100 million and 25% of the lesser of the revolving commitments and the borrowing base and our fixed charge coverage ratio is less than 1.0 to 1.0 (unless availability under the credit agreement is greater than $100 million and 40% of the lesser of the revolving commitments and the borrowing base). As of September 30, 2018, our ability to make restricted payments was not limited as our availability under the borrowing base was more than $100 million, while our fixed charge coverage ratio under our Senior Credit Agreement was less than 1.0 to 1.0. As of December 31, 2017, we had a shortfall of approximately $206.9 million of our net income and retained earnings subject to such restrictions before the fixed charge coverage ratio under our Senior Credit Agreement would exceed 1.0 to 1.0.        
Net income and retained earnings free of restrictions, excess (deficit) of     $ (206,900,000)      
Minimum            
Debt Instrument [Line Items]            
Fixed charge coverage ratio   1.0 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%        
Dividend restrictions, fixed charge coverage ratio   1.0        
Maximum            
Debt Instrument [Line Items]            
Secured debt to EBITDA ratio   4.5        
Dividend restriction threshold as amount of availability with consideration of fixed charge coverage ratio   $ 100,000,000        
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%        
Interest period one (in months)   1 month        
Interest period two (in months)   2 months        
Interest period three (in months)   3 months        
Interest period four (in months)   6 months        
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%        
ABL facility            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity         $ 450,000,000  
ABL facility | LIBOR | Minimum            
Debt Instrument [Line Items]            
Spread over variable rate (percent)   1.50%        
ABL facility | LIBOR | Maximum            
Debt Instrument [Line Items]            
Spread over variable rate (percent)   2.00%        
ABL facility | Alternate Base Rate | Minimum            
Debt Instrument [Line Items]            
Spread over variable rate (percent)   0.50%        
ABL facility | Alternate Base Rate | Maximum            
Debt Instrument [Line Items]            
Spread over variable rate (percent)   1.00%        
Term facility            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity         200,000,000  
Proceeds borrowed from credit facility $ 200,000,000          
Term of facility 4 years          
Asset-based loan facility, portion included in current maturities   $ 77,000,000        
Term facility | LIBOR | Minimum            
Debt Instrument [Line Items]            
Spread over variable rate (percent)   2.50%        
Term facility | LIBOR | Maximum            
Debt Instrument [Line Items]            
Spread over variable rate (percent)   2.75%        
Term facility | Alternate Base Rate | Minimum            
Debt Instrument [Line Items]            
Spread over variable rate (percent)   1.50%        
Term facility | Alternate Base Rate | Maximum            
Debt Instrument [Line Items]            
Spread over variable rate (percent)   1.75%        
Uncommitted incremental facility            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity         $ 150,000,000  
Letters of credit            
Debt Instrument [Line Items]            
Line of credit facility, sublimit   $ 200,000,000        
6% Senior Notes Due 2023 | Senior Notes            
Debt Instrument [Line Items]            
Interest rate   6.00%       6.00%
Senior notes, principal amount           $ 500,000,000
5.625% Senior Notes Due 2027 | Senior Notes            
Debt Instrument [Line Items]            
Interest rate   5.625%   5.625%    
Senior notes, principal amount       $ 300,000,000    
Asset Based Loan Facility | Maximum            
Debt Instrument [Line Items]            
Availability under the ABL facility, more than   $ 100,000,000        
Asset Based Loan Facility | ABL facility | ABL facility            
Debt Instrument [Line Items]            
Asset-based loan facility, portion included in current maturities   $ 0