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Business Combinations (PDX, Inc. - Summary of Information Related to Acquisition) (Details) - USD ($)
$ in Thousands
Jun. 01, 2020
Mar. 10, 2020
Jun. 30, 2020
Mar. 31, 2020
Business Acquisition [Line Items]        
Goodwill     $ 4,112,880 $ 3,795,325
PDX, Inc. [Member]        
Business Acquisition [Line Items]        
Cash $ 962      
Accounts receivable, net of allowance for doubtful accounts 5,739      
Prepaid expenses and other current assets 2,125      
Property and equipment 840      
Goodwill 109,267      
Other noncurrent assets 1,041      
Accounts payable (4,242)      
Deferred revenues, current (8,629)      
Accrued expenses and other current liabilities (4,409)      
Other long-term liabilities (222)      
Total consideration transferred 198,472      
Accounts receivable, allownace for doubtful accounts 1,092      
Tradenames [Member]        
Business Acquisition [Line Items]        
Useful life   18 years    
Tradenames [Member] | PDX, Inc. [Member]        
Business Acquisition [Line Items]        
Identified intangible assets $ 2,000      
Useful life 20 years      
Customer Relationships [Member] | PDX, Inc. [Member]        
Business Acquisition [Line Items]        
Identified intangible assets $ 63,000      
Useful life 15 years      
Technology-Based Intangible Assets [Member] | PDX, Inc. [Member]        
Business Acquisition [Line Items]        
Identified intangible assets $ 31,000      
Useful life 8 years