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ITG Acquisition - Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Mar. 01, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Intangible assets $ 529,638   $ 83,989
Goodwill 1,148,926   836,583
Customer relationships      
Business Acquisition [Line Items]      
Intangible assets 440,144   $ 43,095
Trade names      
Business Acquisition [Line Items]      
Intangible assets 2,600    
ITG      
Business Acquisition [Line Items]      
Intangible assets 517,200    
Goodwill 312,343 $ 357,334  
Total 829,543    
ITG | Technology      
Business Acquisition [Line Items]      
Intangible assets $ 76,000    
Amortization Years 5 years    
ITG | Customer relationships      
Business Acquisition [Line Items]      
Intangible assets $ 437,600    
Amortization Years 10 years    
ITG | Trade names      
Business Acquisition [Line Items]      
Intangible assets $ 3,600    
Amortization Years 3 years