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Debt - Senior Convertible Notes due 2024 (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Line of Credit Facility    
Long-term debt $ 741,636 $ 890,323
Convertible senior notes | Convertible debt    
Line of Credit Facility    
Long-term debt $ 3,300  
Stated interest rate (as a percent) 4.75%  
Effective interest rate (as a percent) 6.05%