Annual report pursuant to Section 13 and 15(d)

Business Acquisitions (Schedule of Assets Acquired and Liabilities Assumed) (Details)

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Business Acquisitions (Schedule of Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
May 01, 2019
Apr. 01, 2019
Jan. 02, 2019
Dec. 31, 2018
Jan. 02, 2018
Dec. 31, 2017
Business Acquisition [Line Items]              
Goodwill $ 879,850       $ 519,102   $ 432,955
FolioDynamix acquisition              
Business Acquisition [Line Items]              
Cash and cash equivalents           $ 4,876  
Accounts receivable           4,962  
Prepaid expenses and other current assets           3,773  
Property and equipment, net           927  
Other non-current assets           441  
Identifiable tangible assets acquired           135,700  
Goodwill           79,891  
Total assets acquired           230,570  
Accounts payable           (5,358)  
Accrued expenses           (7,907)  
Deferred tax liability           (23,300)  
Deferred revenue           (806)  
Other non-current liabilities           (64)  
Total liabilities assumed           (37,435)  
Total net assets acquired           $ 193,135  
Private AI company acquisition              
Business Acquisition [Line Items]              
Total tangible assets acquired       $ 144      
Identifiable tangible assets acquired       4,100      
Goodwill       21,507      
Total liabilities assumed       (688)      
Total net assets acquired       $ 25,063      
PortfolioCenter acquisition              
Business Acquisition [Line Items]              
Total tangible assets acquired     $ 13        
Identifiable tangible assets acquired     11,700        
Goodwill     15,587        
Total liabilities assumed     (1,600)        
Total net assets acquired     25,700        
PIEtech Acquisition              
Business Acquisition [Line Items]              
Cash and cash equivalents   $ 6,360          
Accounts receivable   3,782          
Prepaid expenses and other current assets   969          
Property and equipment, net   6,057          
Other non-current assets   4,274          
Operating lease right-of-use assets, net   2,012          
Identifiable tangible assets acquired   253,000          
Goodwill   323,951          
Total assets acquired   600,405          
Accounts payable and accrued expenses   (1,661)          
Operating lease liabilities   (2,012)          
Deferred tax liability   (68,534)          
Deferred revenue   (7,000)          
Total liabilities assumed   (79,207)          
Total net assets acquired   521,198          
Preliminary Estimate | PortfolioCenter acquisition              
Business Acquisition [Line Items]              
Total tangible assets acquired     13        
Identifiable tangible assets acquired     12,400        
Goodwill     14,987        
Total liabilities assumed     (1,600)        
Total net assets acquired     25,800        
Preliminary Estimate | PIEtech Acquisition              
Business Acquisition [Line Items]              
Cash and cash equivalents   6,360          
Accounts receivable   3,782          
Prepaid expenses and other current assets   969          
Property and equipment, net   6,057          
Other non-current assets   4,274          
Operating lease right-of-use assets, net   1,688          
Identifiable tangible assets acquired   217,000          
Goodwill   353,085          
Total assets acquired   593,215          
Accounts payable and accrued expenses   (2,166)          
Operating lease liabilities   (2,012)          
Deferred tax liability   (59,643)          
Deferred revenue   (7,540)          
Total liabilities assumed   (71,361)          
Total net assets acquired   521,854          
Measurement Period Adjustments | PortfolioCenter acquisition              
Business Acquisition [Line Items]              
Total tangible assets acquired     0        
Identifiable tangible assets acquired     (700)        
Goodwill     600        
Total liabilities assumed     0        
Total net assets acquired     $ (100)        
Measurement Period Adjustments | PIEtech Acquisition              
Business Acquisition [Line Items]              
Cash and cash equivalents   0          
Accounts receivable   0          
Prepaid expenses and other current assets   0          
Property and equipment, net   0          
Other non-current assets   0          
Operating lease right-of-use assets, net   324          
Identifiable tangible assets acquired   36,000          
Goodwill   (29,134)          
Total assets acquired   7,190          
Accounts payable and accrued expenses   505          
Operating lease liabilities   0          
Deferred tax liability   (8,891)          
Deferred revenue   540          
Total liabilities assumed   (7,846)          
Total net assets acquired   $ (656)