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Debt - 2023. 2025 and 2027 Notes (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Nov. 11, 2020
May 18, 2020
Jan. 10, 2017
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2020
Nov. 17, 2020
Dec. 31, 2019
Debt                
Principal amount       $ 389,195   $ 389,195    
Proceeds, net of issuance costs           120,095    
Cash paid for repurchase of notes           81,240    
Loss on extinguishment of debt           (7,841)    
Purchase of capped calls   $ 10,300       10,313    
Reduction of additional paid-in capital for extinguishment of equity component of note repurchased/exchanged           14,714    
2023 Notes                
Debt                
Principal amount     $ 345,000 131,695   131,695   $ 345,000
Interest rate (as a percent)     2.70%          
Proceeds, net of issuance costs     $ 335,800          
Repurchased and retired amount $ 125,000 88,300            
Carrying amount of debt extinguished 113,100 78,100            
Cash paid for repurchase of notes   81,200            
Reduction of additional paid-in capital for extinguishment of equity component of note repurchased/exchanged 14,600 100            
2023 Notes | Other income (expense), net                
Debt                
Loss on extinguishment of debt $ 4,800 3,000   4,800 $ 3,000      
2025 Notes                
Debt                
Principal amount       132,500   132,500 $ 132,500  
Interest rate (as a percent)             3.50%  
2027 Notes                
Debt                
Principal amount   $ 125,000   $ 125,000   $ 125,000    
Interest rate (as a percent)   3.75%            
Proceeds, net of issuance costs   $ 121,900