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Business Combinations - Tirschwell & Loewy, Inc Acquisition (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 01, 2019
Dec. 31, 2019
Dec. 31, 2020
Business Acquisition [Line Items]      
Assets under management $ 822,400    
Tirschwell & Loewy Acquisition      
Business Acquisition [Line Items]      
Goodwill recorded as result of acquisition 8,200    
Contingent consideration liability at fair value $ 6,600   $ 9,400
Additional cash consideration to former stakeholders 3 years    
Contingent consideration limit $ 11,000   $ 11,000
Total cost of acquisition 21,600    
Cash consideration 15,000    
Increase in estimated fair value of contingent consideration liability   $ 2,800  
Tirschwell & Loewy Acquisition | Customer Relationships      
Business Acquisition [Line Items]      
Identifiable intangible assets acquired 12,600    
Tirschwell & Loewy Acquisition | Other Intangible Assets      
Business Acquisition [Line Items]      
Identifiable intangible assets acquired $ 800