Quarterly report pursuant to Section 13 or 15(d)

Acquisitions and Other Investments - Acquisition of 401kplans.com -Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details)

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Acquisitions and Other Investments - Acquisition of 401kplans.com -Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
4 Months Ended
Sep. 30, 2022
May 31, 2022
Dec. 31, 2021
Business Acquisition [Line Items]      
Goodwill $ 996,267   $ 925,154
401kplans.com acquisition      
Business Acquisition [Line Items]      
Tangible assets acquired, net of acquired cash 104 $ 94  
Deferred tax assets acquired, measurement period adjustments 10    
Identifiable intangible assets 3,000 3,000  
Goodwill 11,396 11,378  
Goodwill, measurement period adjustments 18    
Total net assets acquired 14,500 $ 14,472  
Total net assets acquired, measurement period adjustments $ 28