Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Fair Value Measurements (Details)

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Summary of Significant Accounting Policies - Fair Value Measurements (Details) - Senior Notes - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, fair value $ 2,520,000  
Long-term debt 2,470,000  
Unamortized discount and deferred financing costs related to senior notes $ 28,289 $ 12,892