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Debt - Principal Payment Schedule (Details) - USD ($)
Sep. 30, 2021
May 14, 2018
Jul. 31, 2017
Debt Instrument [Line Items]      
Total $ 316,250,000    
Less Than 1 Year 0    
1 - 3 Years 143,750,000    
3 - 5 Years 172,500,000    
2024 Convertible Notes      
Debt Instrument [Line Items]      
Total     $ 143,750,000
Senior Notes | 2024 Convertible Notes      
Debt Instrument [Line Items]      
Total 143,750,000    
Less Than 1 Year 0    
1 - 3 Years 143,750,000    
3 - 5 Years 0    
Senior Notes | 2025 Convertible Notes      
Debt Instrument [Line Items]      
Total 172,500,000 $ 172,500,000  
Less Than 1 Year 0    
1 - 3 Years 0    
3 - 5 Years $ 172,500,000