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Financing Arrangements - Convertible Senior Notes (Details)
1 Months Ended 9 Months Ended
May 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
$ / shares
May 04, 2020
USD ($)
$ / shares
Debt Instrument [Line Items]      
Debt instrument, convertible, conversion ratio   0.0567698  
Debt issuance costs, net   $ 8,527,000  
Debt instrument, convertible, if-converted value in excess of principal   0  
Debt instrument, payment for capped call transactions $ 31,775,000    
Debt instrument, capped call transaction cap price (in dollars per share) | $ / shares     $ 27.10
Convertible Senior Notes, Liability Component      
Debt Instrument [Line Items]      
Debt issuance costs, net   6,005,000  
Convertible Senior Notes, Equity Component      
Debt Instrument [Line Items]      
Debt issuance costs, net   $ 2,522,000  
Convertible Senior Notes      
Debt Instrument [Line Items]      
Debt instrument, convertible, conversion ratio   56.7698  
Debt instrument, face amount     $ 258,750,000
Debt instrument, interest rate, stated percentage     2.75%
Long-term debt   $ 180,458,000  
Unamortized debt issuance expense   5,698,000  
Debt instrument, unamortized discount   $ 72,594,000  
Debt instrument, convertible, remaining discount amortization period   5 years 7 months 6 days  
Debt instrument, convertible, beneficial conversion feature   $ 76,508,000  
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares   $ 17.62