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Financing Arrangements - Convertible Senior Notes (Details)
3 Months Ended
May 04, 2020
USD ($)
day
$ / shares
Mar. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]      
Long-term debt   $ 1,192,422,000 $ 665,163,000
Debt instrument, payment for capped call transactions $ 31,775,000    
Debt instrument, capped call transaction cap price (in dollars per share) | $ / shares $ 27.10    
Arithmetic Average      
Debt Instrument [Line Items]      
Share price | $ / shares   $ 27.74  
Convertible Senior Notes      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 258,750,000    
Interest Rate 2.75%    
Long-term debt   $ 185,861,000  
Debt instrument, unamortized discount   $ 67,584,000  
Debt instrument, convertible, remaining discount amortization period   5 years 1 month 6 days  
Debt instrument, convertible, beneficial conversion feature   $ 76,508,000  
Debt instrument, convertible, conversion ratio 0.0567698    
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares $ 17.62    
Senior Notes | Convertible Senior Notes      
Debt Instrument [Line Items]      
Interest Rate   2.75%  
Debt issuance costs, net   $ 8,527,000  
Debt instrument, convertible, conversion price, percentage 130.00%    
Debt instrument, convertible, threshold trading days | day 20    
Debt instrument, convertible, threshold consecutive trading days | day 30    
Debt instrument, convertible, consecutive trading day period 10 days    
Debt instrument, convertible, percentage of closing price per share 98.00%    
Debt instrument, redemption, consecutive trading day period prior to maturity | day 40    
Debt instrument, redemption price, percentage 130.00%    
Debt instrument, redemption, threshold trading days | day 20    
Debt instrument, redemption, threshold consecutive trading days | day 30    
Senior Notes | Convertible Senior Notes, Liability Component      
Debt Instrument [Line Items]      
Debt issuance costs, net   6,005,000  
Senior Notes | Convertible Senior Notes, Equity Component      
Debt Instrument [Line Items]      
Debt issuance costs, net   2,522,000  
Debt issuance costs, gross   $ 5,305,000 $ 5,504,000