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Fair Value Measurements - Financial Instruments not measured at Fair Value on a Recurring Basis (Details) - Senior Notes - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Fair Value Disclosure $ 1,100,000 $ 0
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Fair Value Disclosure $ 1,133,891 $ 0