Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - 2016 Credit Facilities (Details)

v3.19.1
Long-Term Debt - 2016 Credit Facilities (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
2016 Revolving Credit Facility    
Line of Credit Facility [Line Items]    
2016 Revolving Credit Facility $ 0 $ 0
Revolving Credit Facility | 2016 Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Current borrowing capacity 250,000,000.0  
Maximum borrowing capacity 300,000,000.0  
Borrowing base 217,200,000  
Letters of credit outstanding amount 14,600,000  
Borrowing availability amount 202,600,000  
Revolving Credit Facility | 2016 Credit Facilities    
Line of Credit Facility [Line Items]    
2016 Revolving Credit Facility 0  
Revolving Credit Facility | 2016 New Vehicle Floor Plan Facility and 2016 Used Vehicle Floor Plan Facility    
Line of Credit Facility [Line Items]    
Current borrowing capacity 1,015,000,000.000  
Maximum borrowing capacity $ 1,265,000,000  
Maximum aggregate commitments allocated to commitments under the 2016 Used Vehicle Floor Plan Facility 30.00%