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Fair Value of Financial Instruments - Narrative (Details) - USD ($)
Dec. 31, 2020
Sep. 25, 2020
Jun. 30, 2016
Convertible Senior Notes | Convertible Debt      
Cash and Cash Equivalents [Line Items]      
Fair value of long-term debt $ 782,300,000    
Carrying value of debt $ 467,201,000 $ 461,800,000  
Interest Rate Swap      
Cash and Cash Equivalents [Line Items]      
Notional amount     $ 100,000,000.0
Fixed interest rate     0.80%
Interest Rate Swap | LIBOR      
Cash and Cash Equivalents [Line Items]      
Variable rate floor     0.00%