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Subsequent Events (Details)
9 Months Ended
Oct. 28, 2020
plaintiff
Oct. 23, 2020
Oct. 20, 2020
USD ($)
shares
Oct. 05, 2020
Sep. 30, 2020
Jul. 23, 2018
USD ($)
1.75% Convertible Senior Notes due 2023            
Subsequent Event [Line Items]            
Stated interest rate           1.75%
Aggregated principal amount           $ 143,750,000
Subsequent Event            
Subsequent Event [Line Items]            
Loss Contingency, Number of Plaintiffs | plaintiff 10          
Subsequent Event | 0% Convertible Senior Notes due 2025            
Subsequent Event [Line Items]            
Aggregated principal amount     $ 661,250,000      
Proceeds from convertible debt     648,025,000      
Subsequent Event | 1.75% Convertible Senior Notes due 2023            
Subsequent Event [Line Items]            
Repurchased face amount     116,914,000      
Payment for accrued and unpaid interest     $ 107,365,000      
Common stock (in shares) | shares     2,056,180      
Warehouse Agreement Borrowings | Texas Capital Bank, N.A.            
Subsequent Event [Line Items]            
Decrease in rate of interest accruing on outstanding principal         0.50%  
Stated interest rate         3.50%  
Warehouse Agreement Borrowings | Texas Capital Bank, N.A. | Subsequent Event            
Subsequent Event [Line Items]            
Decrease in rate of interest accruing on outstanding principal       0.25%    
Stated interest rate       3.35%    
Warehouse Agreement Borrowings | Western Alliance Bank | London Interbank Offered Rate (LIBOR)            
Subsequent Event [Line Items]            
Stated interest rate         3.50%  
Debt instrument, basis spread on variable rate         2.00%  
Warehouse Agreement Borrowings | Western Alliance Bank | Subsequent Event | London Interbank Offered Rate (LIBOR)            
Subsequent Event [Line Items]            
Stated interest rate   3.25%        
Debt instrument, basis spread on variable rate   2.00%