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Debt - Convertible Senior Notes and Capped Call (Narrative) (Details)
 1 Months Ended 2 Months Ended 3 Months Ended 9 Months Ended
May 31, 2020
USD ($)
shares
May 31, 2018
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
$ / shares
Sep. 30, 2023
USD ($)
$ / shares
shares
Sep. 30, 2022
USD ($)
shares
Sep. 30, 2023
USD ($)
day
$ / shares
Rate
shares
Sep. 30, 2022
USD ($)
shares
Sep. 29, 2023
$ / shares
Dec. 31, 2022
USD ($)
May 21, 2020
$ / shares
Debt Instrument [Line Items]                    
Cash consideration to repurchase note           $ 0 $ 34,057,000      
Interest expense, debt       $ 0 $ 0 0 0      
Issuance of common stock upon partial conversion of the 2023 convertible senior notes         $ (16,000) $ 0 $ (275,000)      
Common Stock                    
Debt Instrument [Line Items]                    
Equity component from partial repurchase of 2023 convertible senior notes (in shares) | shares         0 2,000 574,000      
Convertible Senior Notes, Due 2025 | Convertible Debt                    
Debt Instrument [Line Items]                    
Stated interest rate on debt (as a percent)     0.50%              
Proceeds from issuance of debt     $ 728,800,000              
Conversion ratio on convertible debt | Rate           0.74437%        
Conversion price on convertible debt (in USD per share) | $ / shares       $ 134.34   $ 134.34        
Premium on conversion price in relation to closing price (as a percent)                   30.00%
Closing price of common stock (in USD per share) | $ / shares               $ 64.30   $ 103.34
Share price of common stock with conversion premium (in USD per share) | $ / shares       $ 174.64   $ 174.64        
Sinking fund payment           $ 0        
Cap price of the capped call transactions (in USD per share) | $ / shares     $ 206.68              
Number of shares covered in the capped call transactions (in shares) | shares       5,600,000   5,600,000        
Long-term debt       $ 741,169,000   $ 741,169,000     $ 738,376,000  
Interest expense, debt       $ 934,000 $ 935,000 $ 2,803,000 $ 2,804,000      
Convertible Senior Notes, Due 2025 | Convertible Debt | Fundamental Change Event                    
Debt Instrument [Line Items]                    
Debt redemption price as percentage of principal amount (as a percent)           100.00%        
Convertible Senior Notes, Due 2025 | Convertible Debt | On or After June 6, 2023                    
Debt Instrument [Line Items]                    
Number of trading days (in days) | day           20        
Number of consecutive trading days (in days) | day           30        
Threshold percentage of stock price trigger (as a percent)           130.00%        
Debt redemption price as percentage of principal amount (as a percent)           100.00%        
Number of trading days preceding notice of redemption (in days) | day           2        
Convertible Senior Notes, Due 2025 | Convertible Debt | Convertible, Term One                    
Debt Instrument [Line Items]                    
Number of trading days (in days) | day           20        
Number of consecutive trading days (in days) | day           30        
Threshold percentage of stock price trigger (as a percent)           130.00%        
Convertible Senior Notes, Due 2025 | Convertible Debt | Convertible, Term Two                    
Debt Instrument [Line Items]                    
Number of trading days (in days) | day           5        
Number of consecutive trading days (in days) | day           5        
Threshold percentage of stock price trigger (as a percent)           98.00%        
Convertible Senior Notes, Due 2025 | Convertible Debt | Private Placement                    
Debt Instrument [Line Items]                    
Aggregate principal amount of debt     $ 747,500,000              
Option to purchase additional debt through private offering     $ 97,500,000              
Convertible Senior Notes, Due 2023 | Convertible Debt                    
Debt Instrument [Line Items]                    
Stated interest rate on debt (as a percent) 0.125%                  
Proceeds from issuance of debt   $ 250,800,000                
Conversion price on convertible debt (in USD per share) | $ / shares       $ 40.82   $ 40.82        
Cap price of the capped call transactions (in USD per share) | $ / shares   $ 62.80                
Number of shares covered in the capped call transactions (in shares) | shares       6,300,000   6,300,000        
Debt instrument, repurchase amount $ 181,000,000     $ 194,700,000   $ 194,700,000        
Aggregate consideration to repurchase note 449,600,000                  
Cash consideration to repurchase note $ 181,000,000                  
Long-term debt       $ 0   $ 0     $ 200,000  
Convertible Senior Notes, Due 2023 | Convertible Debt | Common Stock                    
Debt Instrument [Line Items]                    
Equity component from partial repurchase of 2023 convertible senior notes (in shares) | shares 2,723,581         370,877        
Issuance of common stock upon partial conversion of the 2023 convertible senior notes           $ 74,500,000        
Convertible Senior Notes, Due 2023 | Convertible Debt | Private Placement                    
Debt Instrument [Line Items]                    
Aggregate principal amount of debt   $ 258,800,000