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Debt - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Jul. 31, 2020
Jun. 30, 2020
May 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Subsequent Event | Share Buyback Loans          
Debt Instrument [Line Items]          
Share repurchase program, amount authorized $ 80.0        
Class A Common Stock | Subsequent Event | Share Buyback Loans          
Debt Instrument [Line Items]          
Shares authorized to be repurchased (in shares) 8,000,000        
Series A Preferred Stock          
Debt Instrument [Line Items]          
Shares authorized to be repurchased (in shares)     1,000,000    
Senior Secured Revolving Credit Facility | Class A Common Stock          
Debt Instrument [Line Items]          
Shares authorized to be repurchased (in shares)   10,000,000      
Senior Secured Revolving Credit Facility | Series A Preferred Stock          
Debt Instrument [Line Items]          
Share repurchase program, amount authorized   $ 92.7      
Senior Secured Revolving Credit Facility | Common Class A and Common Class B          
Debt Instrument [Line Items]          
Default share limit, minimum amount (in shares)   13,600,000      
Senior Credit Facility          
Debt Instrument [Line Items]          
Outstanding letters of credit   $ 35.0   $ 37.4  
Senior Credit Facility | Senior Secured Revolving Credit Facility          
Debt Instrument [Line Items]          
Maximum leverage ratio   250.00%      
Percentage of obligations, limit   50.00%      
Maximum senior secured leverage ratio   185.00%      
Debt default, material judgment (in excess of)   $ 5.0      
Senior Credit Facility | Senior Secured Revolving Credit Facility | Minimum          
Debt Instrument [Line Items]          
Fixed charge coverage ratio   125.00%      
Shares authorized to be repurchased (in shares)   10,000,000.0      
Senior Credit Facility | Fourth Amendment to Senior Credit Facility | Class A Common Stock | Subsequent Event          
Debt Instrument [Line Items]          
Shares authorized to be repurchased (in shares) 8,000,000        
Subordinated Debt | Retailco          
Debt Instrument [Line Items]          
Subordinated debt         $ 25.0
Subordinated debt, advances, no less than   $ 1.0      
Subordinated debt, interest rate on advances   5.00%      
Minimum availability under the borrowing base   $ 5.0      
Revolving Credit Facility | Acquisition Line | Eurodollar          
Debt Instrument [Line Items]          
Basis spread on variable rate   3.75%      
Revolving Credit Facility | Acquisition Line | Base Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate   2.75%      
Revolving Credit Facility | Fourth Amendment to Senior Credit Facility | Eurodollar | Share Buyback Loans          
Debt Instrument [Line Items]          
Basis spread on variable rate   4.50%      
Revolving Credit Facility | Fourth Amendment to Senior Credit Facility | Base Rate | Share Buyback Loans          
Debt Instrument [Line Items]          
Basis spread on variable rate   3.50%      
Revolving Credit Facility | Senior Credit Facility          
Debt Instrument [Line Items]          
Capitalized financing costs   $ 0.9   1.3  
Capitalized financing costs, other current   0.9   0.9  
Capitalized financing costs, other non-current   $ 0.0   $ 0.4  
Nonutilization fee, percent   0.50%      
Revolving Credit Facility | Senior Credit Facility | Working Capital Line | Eurodollar          
Debt Instrument [Line Items]          
Basis spread on variable rate   3.00%      
Revolving Credit Facility | Senior Credit Facility | Working Capital Line | Base Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate   2.00%      
Revolving Credit Facility | Senior Credit Facility | Fourth Amendment to Senior Credit Facility | Subsequent Event          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity $ 187.5        
Fixed charge coverage ratio 110.00%        
Revolving Credit Facility | Senior Credit Facility | Fourth Amendment to Senior Credit Facility | Eurodollar | Subsequent Event          
Debt Instrument [Line Items]          
Basis spread on variable rate 3.25%        
Revolving Credit Facility | Senior Credit Facility | Fourth Amendment to Senior Credit Facility | Base Rate | Subsequent Event          
Debt Instrument [Line Items]          
Basis spread on variable rate 2.25%        
Revolving Credit Facility | Senior Credit Facility | Fourth Amendment to Senior Credit Facility | Federal Funds Rate | Subsequent Event          
Debt Instrument [Line Items]          
Basis spread on variable rate 0.50%        
Revolving Credit Facility | Senior Credit Facility | Fourth Amendment to Senior Credit Facility | Reference Eurodollar Rate | Subsequent Event          
Debt Instrument [Line Items]          
Basis spread on variable rate 1.00%