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Convertible Senior Notes, Net (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2017
USD ($)
offering
Debt Instrument [Line Items]          
Proceeds from issuance of senior secured notes   $ 500,000,000 $ 0 $ 0  
Conversions of convertible senior notes for common stock       33,778,000  
Common Stock          
Debt Instrument [Line Items]          
Share price (in dollars per share) | $ / shares   $ 13.16      
Conversions of convertible senior notes for common stock       20,000  
Additional Paid-In-Capital          
Debt Instrument [Line Items]          
Conversions of convertible senior notes for common stock       33,758,000  
Convertible Debt          
Debt Instrument [Line Items]          
Debt instrument, face amount   $ 575,000,000 575,000,000    
Interest expense   28,800,000 28,800,000 29,100,000  
Non-cash interest expense   6,300,000 6,000,000 $ 6,000,000  
Convertible Debt | 2022 Notes          
Debt Instrument [Line Items]          
Number of debt offerings issued | offering         2
Debt instrument, face amount   $ 345,000,000 $ 345,000,000   $ 345,000,000
Stated interest rate   4.75% 4.75%   4.75%
Proceeds from issuance of senior secured notes         $ 337,500,000
Convertible senior notes, net   $ 343,100,000      
Unamortized discount   1,900,000      
Convertible Debt | 2022 Notes | Additional Paid-In-Capital          
Debt Instrument [Line Items]          
Conversions of convertible senior notes for common stock   11,000,000      
Convertible Debt | 2023 Notes          
Debt Instrument [Line Items]          
Debt instrument, face amount $ 230,000,000 $ 230,000,000 $ 230,000,000    
Stated interest rate 5.375% 5.38% 5.38%    
Proceeds from issuance of senior secured notes $ 223,700,000        
Convertible senior notes, net   $ 226,900,000      
Unamortized discount   3,100,000      
Convertible Debt | 2023 Notes | Additional Paid-In-Capital          
Debt Instrument [Line Items]          
Conversions of convertible senior notes for common stock   4,400,000      
Convertible Debt | 2022 and 2023 Notes | Additional Paid-In-Capital          
Debt Instrument [Line Items]          
Conversions of convertible senior notes for common stock   $ 15,400,000