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Debt - Secured Revolving Credit Facility (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]        
Inventory $ 49,158 $ 74,590    
Cash, Cash Equivalents, Restricted Cash 945,820 247,448 $ 439,055 $ 212,658
Revolving Credit Facility        
Debt Instrument [Line Items]        
Net Assets 65,191 16,200    
Inventory 47,620 7,456    
Amortization of debt issuance costs 619 256    
Cash, Cash Equivalents, Restricted Cash 11,818 5,663    
Contractual interest expense 643 17    
Goldman Sachs Bank USA | Revolving Credit Facility        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity 100,000 100,000    
Long-term line of credit $ 23,949 $ 4,444    
Debt, weighted average interest rate 4.40% 4.45%    
Goldman Sachs Bank USA | Revolving Credit Facility | Minimum        
Debt Instrument [Line Items]        
Debt instrument, floor rate of basis spread on variable rate 0.50%      
Goldman Sachs Bank USA | Revolving Credit Facility | Maximum        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate 2.65%