Annual report pursuant to Section 13 and 15(d)

Acquisitions (Schedule of Assets Acquired And Liabilities Assumed, 401kplans.com) (Details)

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Acquisitions (Schedule of Assets Acquired And Liabilities Assumed, 401kplans.com) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
May 31, 2022
Dec. 31, 2021
Business Acquisition [Line Items]        
Goodwill $ 806,563 $ 998,414   $ 925,154
401kplans.com        
Business Acquisition [Line Items]        
Tangible assets acquired, net of cash received     $ 104  
Identifiable intangible assets     3,000  
Goodwill     11,396  
Total net assets acquired, net of cash received     $ 14,500