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Convertible Senior Notes - Due 2022 - Other (Details)
$ / shares in Units, shares in Millions
3 Months Ended 6 Months Ended
May 19, 2020
USD ($)
shares
Jun. 27, 2017
USD ($)
D
item
$ / shares
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Convertible Senior Notes              
Loss on extinguishment of debt     $ (7,751,000) $ 0 $ (7,751,000) $ 0  
Net proceeds from offering         1,000,000,000 0  
Offering costs         24,070,000 $ 0  
2022 Notes              
Convertible Senior Notes              
Principal amount of debt exchanged for shares of the Company's common stock in private placement transactions $ 228,200,000            
Payment of cash for repurchase of convertible debt $ 231,100,000            
Shares issued for exchange of debt | shares 3.9            
Loss on extinguishment of debt $ 7,700,000            
Face amount   $ 275,000,000 $ 46,771,000   $ 46,771,000   $ 274,995,000
Interest rate (as a percent)   3.00%          
Net proceeds from offering   $ 263,700,000          
Offering costs   11,300,000          
Principal multiple amount used in the conversion of the debt instrument   $ 1,000          
Convertible debt, conversion rate   22.7247          
Convertible debt, conversion price (in dollars per share) | $ / shares   $ 44.00          
Trading day observation period used to determine the amount of cash and shares, if any, that are due upon conversion | item   25          
Debt term   5 years 6 months          
Convertible debt, equity component   $ 62,400,000          
2022 Notes | At any time prior to close of business on the business day immediately preceding June 15, 2022              
Convertible Senior Notes              
Principal multiple amount used in the conversion of the debt instrument   $ 1,000          
Convertible debt, threshold, trading days | D   20          
Convertible debt, threshold, consecutive trading days | D   30          
Minimum percentage of common stock price as a percentage of the conversion price   130.00%          
Convertible debt, number of business days, measurement period | D   5          
Convertible debt, number of consecutive trading days, measurement period | D   10          
Trading price expressed as a percentage of the last reported sales price and conversion rate after the specified consecutive trading day period   98.00%          
2022 Notes | On or after December 22, 2020              
Convertible Senior Notes              
Convertible debt, threshold, trading days | D   20          
Convertible debt, threshold, consecutive trading days | D   30          
Minimum percentage of common stock price as a percentage of the conversion price   130.00%