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Net (Loss) Income Per Share - Calculation of Basic and Diluted Net Income Per Share (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2021
Aug. 31, 2020
Sep. 30, 2019
Mar. 31, 2018
Numerator:                    
Net income $ 61,915,000 $ 73,123,000 $ 136,452,000 $ 159,232,000            
Add back interest expense, net of tax attributable to assumed conversion of convertible senior notes 1,595,000 1,591,000 3,190,000 3,183,000            
Net income attributable to common stockholders—diluted $ 63,510,000 $ 74,714,000 $ 139,642,000 $ 162,415,000            
Denominator:                    
Weighted average common shares outstanding—basic (in shares) 123,463,325 127,088,053 123,971,210 127,171,302            
Dilutive effect of assumed conversion of convertible senior notes (in shares) 14,714,080 14,716,008 14,714,487 14,716,029            
Weighted average common shares outstanding - diluted (in shares) 141,010,561 145,683,336 142,010,943 146,373,492            
Net (loss) income per share attributable to common stockholders—basic (in dollars per share) $ 0.50 $ 0.58 $ 1.10 $ 1.25            
Net (loss) income per share attributable to common stockholders—diluted (in dollars per share) $ 0.45 $ 0.51 $ 0.98 $ 1.11            
Convertible Debt                    
Denominator:                    
Principal $ 2,299,887,000   $ 2,299,887,000     $ 2,299,976,000        
Convertible Debt | 2021 Notes                    
Denominator:                    
Principal 1,000,000,000   1,000,000,000     1,000,000,000 $ 1,000,000,000      
Debt instrument, interest rate (as a percent)             0.25%      
Convertible Debt | 2020 Notes                    
Denominator:                    
Principal 650,000,000   650,000,000     650,000,000   $ 650,000,000    
Debt instrument, interest rate (as a percent)               0.125%    
Convertible Debt | 2019 Notes                    
Denominator:                    
Debt instrument, interest rate (as a percent)                 0.125%  
Principal, net of conversion notices 649,887,000   649,887,000     649,932,000     $ 649,900,000  
Convertible Debt | 2018 Notes                    
Denominator:                    
Debt instrument, interest rate (as a percent)                   0.00%
Principal, net of conversion notices $ 0   $ 0   $ 44,000 $ 44,000        
Stock Options                    
Denominator:                    
Dilutive effect of assumed conversion (in shares) 2,290,539 2,809,359 2,454,264 3,096,439            
Restricted stock units                    
Denominator:                    
Dilutive effect of assumed conversion (in shares) 542,617 1,069,916 870,982 1,389,722