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Convertible Senior Notes - Convertible Senior Notes (Details)
1 Months Ended 12 Months Ended
Apr. 30, 2019
USD ($)
$ / shares
shares
Mar. 31, 2019
USD ($)
Apr. 30, 2018
USD ($)
day
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]            
Net proceeds       $ 780,180,000 $ 335,618,000 $ 0
Document Period End Date       Dec. 31, 2019    
Shares related to convertible senior notes | 0.125 Percent Convertible Senior Notes Due 2025            
Debt Instrument [Line Items]            
Face amount   $ 700,000,000   $ 800,000,000    
Interest rate, stated percentage   0.125%        
Option to purchase additional notes $ 100,000,000          
Principal amount 800,000,000          
Less initial purchasers’ discount (18,998,000)          
Less other issuance costs (822,000)          
Net proceeds 780,180,000          
Conversion ratio   0.019396        
Equity component 212,000,000.0     $ 206,747,000    
Debt issuance costs $ (19,800,000)          
Debt instrument, remaining useful life       5 years 2 months 12 days    
Face value       $ 211,800,000    
Principal       588,200,000    
Interest rate, effective percentage 5.40%          
Conversion price | $ / shares $ 51.56          
Shares related to convertible senior notes | 0.25% Convertible Senior Notes Due 2023            
Debt Instrument [Line Items]            
Face amount     $ 345,000,000 345,000,000 345,000,000  
Interest rate, stated percentage     0.25%      
Option to purchase additional notes     $ 45,000,000      
Principal amount     345,000,000      
Less initial purchasers’ discount     (8,625,000)      
Less other issuance costs     (757,000)      
Net proceeds     $ 335,618,000      
Conversion ratio     0.037051      
Equity component     $ 64,200,000 $ 62,444,000 $ 62,444,000  
Debt issuance costs     $ (9,400,000)      
Debt instrument, remaining useful life       3 years 4 months 24 days    
Share price (in dollars per share) | $ / shares       $ 37.91    
Principal       $ 485,300,000    
Value in excess of principal       $ 140,300,000    
Interest rate, effective percentage     4.34%      
Conversion price | $ / shares     $ 26.95      
Sale Price Is Greater Or Equal 130% | Shares related to convertible senior notes | 0.125 Percent Convertible Senior Notes Due 2025            
Debt Instrument [Line Items]            
Threshold trading days | day     20      
Threshold consecutive trading days | day     30      
Threshold percentage of stock price trigger     130.00%      
Sale Price Is Greater Or Equal 130% | Shares related to convertible senior notes | 0.25% Convertible Senior Notes Due 2023            
Debt Instrument [Line Items]            
Threshold trading days | day     20      
Threshold consecutive trading days | day     30      
Threshold percentage of stock price trigger     130.00%      
Trading Price Per $1,000 Principal Amount Less Than 98% | Shares related to convertible senior notes | 0.125 Percent Convertible Senior Notes Due 2025            
Debt Instrument [Line Items]            
Threshold trading days | day     5      
Threshold consecutive trading days | day     10      
Trading Price Per $1,000 Principal Amount Less Than 98% | Shares related to convertible senior notes | 0.125 Percent Convertible Senior Notes Due 2025 | Maximum            
Debt Instrument [Line Items]            
Threshold percentage of stock price trigger     98.00%      
Trading Price Per $1,000 Principal Amount Less Than 98% | Shares related to convertible senior notes | 0.25% Convertible Senior Notes Due 2023            
Debt Instrument [Line Items]            
Threshold trading days | day     5      
Threshold consecutive trading days | day     10      
Trading Price Per $1,000 Principal Amount Less Than 98% | Shares related to convertible senior notes | 0.25% Convertible Senior Notes Due 2023 | Maximum            
Debt Instrument [Line Items]            
Threshold percentage of stock price trigger     98.00%      
Liability component | Shares related to convertible senior notes | 0.125 Percent Convertible Senior Notes Due 2025            
Debt Instrument [Line Items]            
Net carrying amount $ 588,000,000.0          
Debt issuance costs (14,600,000)          
Liability component | Shares related to convertible senior notes | 0.25% Convertible Senior Notes Due 2023            
Debt Instrument [Line Items]            
Net carrying amount     $ 280,800,000      
Debt issuance costs     (7,600,000)      
Equity component | Shares related to convertible senior notes | 0.125 Percent Convertible Senior Notes Due 2025            
Debt Instrument [Line Items]            
Debt issuance costs (5,300,000)          
Equity component | Shares related to convertible senior notes | 0.25% Convertible Senior Notes Due 2023            
Debt Instrument [Line Items]            
Debt issuance costs     (1,700,000)      
Capped Call | Shares related to convertible senior notes | 0.125 Percent Convertible Senior Notes Due 2025            
Debt Instrument [Line Items]            
Net proceeds $ 97,200,000          
Shares covered by capped call transactions (in shares) | shares 15,516,480          
Conversion price | $ / shares $ 79.32          
Capped Call | Shares related to convertible senior notes | 0.25% Convertible Senior Notes Due 2023            
Debt Instrument [Line Items]            
Net proceeds     $ 39,200,000      
Shares covered by capped call transactions (in shares) | shares     12,801,260      
Conversion price | $ / shares     $ 40.68