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Leases - Narrative (Details)
$ in Thousands, ft² in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
building
lease
Dec. 31, 2020
USD ($)
ft²
country
location
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2019
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Operating lease right-of-use assets $ 125,110 $ 125,110   $ 64,191  
Other accrued liabilities 37,892 37,892   21,932  
Other noncurrent liabilities 97,403 97,403   49,970  
Rent expense     $ 30,000    
Lease liabilities 135,295 $ 135,295   $ 71,902  
Square feet of office space leased (in sqft) | ft²   1.3      
Number of locations with leased office spaces | location   70      
Number of countries with leased office spaces | country   38      
Optional lease extension term   10 years      
Option period to terminate leases   2 years      
Two Headquarter Buildings          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Operating lease right-of-use assets $ 56,000 $ 56,000      
Sale-leaseback transaction, number of headquarters buildings | building 2        
Sale-leaseback transaction, purchase price $ 69,000 $ 69,000      
Number of contracts | lease 2        
Renewal term 10 years 10 years      
Lease liabilities $ 46,000 $ 46,000      
Sale-leaseback gain   $ 10,000      
Minimum          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Operating remaining lease term 1 year 1 year      
Finance remaining lease term 1 year 1 year      
Minimum | Two Headquarter Buildings          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Sale-leaseback transaction, term of contract 12 years        
Maximum          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Operating remaining lease term 12 years 12 years      
Finance remaining lease term 12 years 12 years      
Maximum | Two Headquarter Buildings          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Sale-leaseback transaction, term of contract 18 months        
ASU 2016-02          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Operating lease right-of-use assets         $ 72,000
Other accrued liabilities         25,000
Other noncurrent liabilities         $ 47,000