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ITG Acquisition - Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 01, 2019
Mar. 31, 2019
Dec. 31, 2018
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill      
Intangible assets   $ 552,547 $ 83,989
Goodwill   1,193,697 836,583
Customer relationships      
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill      
Intangible assets   421,762 $ 43,095
Trade names      
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill      
Intangible assets   $ 3,500  
ITG      
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill      
Intangible assets $ 479,600    
Goodwill 357,334    
Total 836,934    
ITG | Technology      
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill      
Intangible assets $ 93,000    
Amortization Years 5 years    
ITG | Customer relationships      
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill      
Intangible assets $ 383,000    
Amortization Years 10 years    
ITG | Trade names      
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill      
Intangible assets $ 3,600    
Amortization Years 3 years