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Debt - Additional Information (Details)
May 15, 2020
USD ($)
day
$ / shares
Feb. 07, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 17, 2020
USD ($)
May 12, 2020
$ / shares
Mar. 11, 2019
USD ($)
Debt Instrument [Line Items]            
Share price (in dollars per share) | $ / shares         $ 29.53  
Net carrying amount of liability component     $ 659,198,000      
Flexdrive Services, LLC | Revolving Credit Facility            
Debt Instrument [Line Items]            
Maximum exposure to loss under terms of the guarantee     $ 33,700,000      
Procurement Provider | Revolving Credit Facility            
Debt Instrument [Line Items]            
Maximum borrowing capacity       $ 50,000,000.0   $ 95,000,000.0
Convertible Senior Notes Due 2025            
Debt Instrument [Line Items]            
Interest rate     1.50%      
Net carrying amount of liability component     $ 560,194,000      
Convertible Senior Notes Due 2025 | Convertible Debt            
Debt Instrument [Line Items]            
Aggregate principal $ 747,500,000          
Interest rate 1.50%          
Net proceeds from issuance of convertible debt $ 733,200,000          
Conversation rate 0.0260491          
Initial conversion price (in dollars per share) | $ / shares $ 38.39          
Initial conversion price of convertible debt, premium percentage 30.00%          
Limitation on sale of common stock, sale price threshold, number of trading days | day 20          
Number of consecutive business days 5 days          
Redemption price percentage 100.00%          
Net carrying amount of liability component $ 558,300,000   560,194,000      
Carrying value of equity component $ 189,200,000          
Effective interest rate 8.00%          
Debt and equity components of convertible loans, discounts and commissions payable $ 14,300,000          
Issuance costs attributable to the liability component of convertible debt 10,700,000          
Fair value of long-term debt     778,500,000      
Cost of capped call transactions $ 132,700,000          
Initial cap price (in dollars per share) | $ / shares $ 73.83          
Initial cap price premium percentage 150.00%          
Convertible Senior Notes Due 2025 | Convertible Debt | Debt Instrument, Redemption, Period One            
Debt Instrument [Line Items]            
Limitation on sale of common stock, sale price threshold, trading period | day 30          
Threshold percentage of stock price trigger 130.00%          
Convertible Senior Notes Due 2025 | Convertible Debt | Debt Instrument, Redemption, Period Two            
Debt Instrument [Line Items]            
Limitation on sale of common stock, sale price threshold, trading period | day 5          
Threshold percentage of stock price trigger 98.00%          
Non-Revolving Loan            
Debt Instrument [Line Items]            
Net carrying amount of liability component     85,251,000      
Fair value of long-term debt     $ 87,000,000.0      
Non-Revolving Loan | Minimum            
Debt Instrument [Line Items]            
Interest rate     3.75%      
Debt term   24 months        
Non-Revolving Loan | Minimum | LIBOR            
Debt Instrument [Line Items]            
Variable interest percentage   2.68%        
Non-Revolving Loan | Maximum            
Debt Instrument [Line Items]            
Interest rate     5.25%      
Debt term   48 months        
Non-Revolving Loan | Maximum | LIBOR            
Debt Instrument [Line Items]            
Variable interest percentage   2.88%        
Non-Revolving Loan | Flexdrive Services, LLC            
Debt Instrument [Line Items]            
Maximum borrowing capacity   $ 300,000,000        
Master Vehicle Loan            
Debt Instrument [Line Items]            
Net carrying amount of liability component     $ 13,753,000      
Fair value of long-term debt     $ 13,900,000      
Interest rate swap term   3 years        
Variable interest spread rate   2.45%        
Master Vehicle Loan | LIBOR            
Debt Instrument [Line Items]            
Spread on variable rate   3.00%        
Master Vehicle Loan | Minimum            
Debt Instrument [Line Items]            
Interest rate     2.70%      
Debt term   12 months        
Master Vehicle Loan | Maximum            
Debt Instrument [Line Items]            
Interest rate     6.75%      
Debt term   60 months        
Master Vehicle Loan | Flexdrive Services, LLC            
Debt Instrument [Line Items]            
Maximum borrowing capacity   $ 50,000,000