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Business Acquisitions (Allocation of Aggregate Purchase Price) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Business Acquisition [Line Items]    
Goodwill $ 1,861,332 $ 1,867,430
Deferred revenue (7,200)  
Fiscal 2021 Acquisitions    
Business Acquisition [Line Items]    
Accounts receivable 5,167  
Prepaid expenses and other current assets 1,639  
Property and equipment 1,838  
Operating lease right-of-use assets, noncurrent 5,888  
Goodwill 85,552  
Deferred tax asset 230  
Accounts payable and accrued expenses (2,800)  
Deferred revenue (7,192)  
Operating lease liabilities, current (7,191)  
Other current liabilities (14)  
Deferred tax liability (4,936)  
Other long-term liabilities (1,726)  
 Total 135,104  
Fiscal 2021 Acquisitions | Trade names    
Business Acquisition [Line Items]    
Finite-lived intangible assets 11,843  
Fiscal 2021 Acquisitions | Customer relationship    
Business Acquisition [Line Items]    
Finite-lived intangible assets 11,521  
Fiscal 2021 Acquisitions | Other intangibles    
Business Acquisition [Line Items]    
Finite-lived intangible assets $ 35,285