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Debt - Narrative (Details)
$ / shares in Units, shares in Millions
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2020
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
day
$ / shares
shares
Jun. 30, 2019
USD ($)
Debt Instrument [Line Items]        
Gross proceeds from issuance of convertible senior notes $ 562,500,000   $ 575,000,000 $ 0
Convertible debt, conversion ratio     0.0267187  
Conversion price (in dollars per share) | $ / shares   $ 37.43 $ 37.43  
Convertible debt, equity component $ 205,300,000 $ 200,812,000 $ 200,812,000  
Issuance cost, equity component   $ 4,478,000 4,478,000  
Issuance cost, equity component     $ 0 $ 969,000
Remaining life     59 months  
Shares covered by capped calls (in shares) | shares   15.4 15.4  
Purchases of capped calls related to convertible senior notes   $ 67,333,000 $ 67,333,000  
Class A common stock        
Debt Instrument [Line Items]        
Capped call, initial strike price (in dollars per share) | $ / shares $ 37.43      
Capped call, initial cap price (in dollars per share) | $ / shares $ 57.58      
Convertible Senior Notes        
Debt Instrument [Line Items]        
Debt principal amount $ 575,000,000.0      
Face amount, additional principal issuable $ 75,000,000.0      
Interest rate 0.75% 0.75% 0.75%  
Issuance cost, liability component $ 8,000,000.0      
Issuance cost, equity component $ 4,500,000      
Measurement Input, Effective Interest Rate | Convertible Senior Notes        
Debt Instrument [Line Items]        
Measurement input   0.100 0.100  
Scenario One, Prior to February 14, 2025        
Debt Instrument [Line Items]        
Conversion requirement, threshold trading days | day     20  
Conversion requirement, threshold consecutive trading days | day     30  
Conversion requirement, threshold percentage of stock price trigger     130.00%  
Scenario Two, Prior to February 14, 2025        
Debt Instrument [Line Items]        
Conversion requirement, threshold consecutive trading days | day     5  
Conversion requirement, threshold percentage of stock price trigger     98.00%  
Conversion requirement, threshold business days following consecutive trading days | day     5  
Scenario Three, Subsequent to May 20, 2023        
Debt Instrument [Line Items]        
Conversion requirement, threshold trading days | day     20  
Conversion requirement, threshold consecutive trading days | day     30  
Scenario Three, Subsequent to May 20, 2023 | Convertible Senior Notes        
Debt Instrument [Line Items]        
Conversion requirement, threshold percentage of stock price trigger     130.00%  
Redemption price, percentage     100.00%  
Scenario Four, Fundamental Change | Convertible Senior Notes        
Debt Instrument [Line Items]        
Redemption price, percentage     100.00%