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Debt - Convertible Senior Notes and Capped Call (Narrative) (Details)
 1 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended
May 31, 2020
USD ($)
shares
May 31, 2018
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
$ / shares
Jun. 30, 2023
USD ($)
$ / shares
shares
Jun. 30, 2022
USD ($)
shares
Jun. 30, 2023
USD ($)
day
$ / shares
Rate
shares
Jun. 30, 2022
USD ($)
shares
Dec. 31, 2022
USD ($)
May 21, 2020
$ / shares
Debt Instrument [Line Items]                  
Interest expense, debt       $ 0 $ 0 $ 0 $ 0    
Cash consideration to repurchase note           0 34,034,000    
Issuance of common stock upon partial conversion of the 2023 convertible senior notes         $ (15,000) $ 0 $ (259,000)    
Common Stock                  
Debt Instrument [Line Items]                  
Equity component from partial repurchase of 2023 convertible senior notes (in shares) | shares       2,000 34,000 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       82.45   82.45     $ 103.34
Share price of common stock with conversion premium (in USD per share) | $ / shares       $ 174.64   $ 174.64      
Sinking fund payment           $ 0      
Long-term debt       $ 740,215,000   740,215,000   $ 738,376,000  
Interest expense, debt       $ 934,000 $ 934,000 $ 1,868,000 $ 1,869,000    
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      
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 ratio on convertible debt | Rate           2.44978%      
Conversion price on convertible debt (in USD per share) | $ / shares       $ 40.82   $ 40.82      
Long-term debt       $ 0   $ 0   $ 200,000  
Cap price of the capped call transactions (in USD per share) | $ / shares   $ 62.80              
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                
Number of shares covered in the capped call transactions (in shares) | shares       6,300,000   6,300,000      
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