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Basis of Presentation and Summary of Significant Accounting Policies - Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accrued interest $ 122,445 $ 123,935
Payroll-related accruals 126,611 99,771
Other accrued liabilities 280,710 264,294
Accrued expenses and other current liabilities $ 625,967 $ 584,151