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Fair Value Measurements - Narrative (Details)
$ in Thousands
1 Months Ended 3 Months Ended
Jan. 31, 2020
USD ($)
shares
Feb. 28, 2019
USD ($)
shares
Mar. 31, 2020
USD ($)
numberOfSecurities
Mar. 31, 2019
USD ($)
Business Acquisition [Line Items]        
Number of securities in net loss positions | numberOfSecurities     4  
Acquisition-related contingent payments     $ 8,751 $ 9,542
GoMedigap        
Business Acquisition [Line Items]        
Acquisition-related contingent payments $ 8,800 $ 9,500    
Earnout consideration (in shares) | shares 294,608 294,608    
Stock issued for acquisition $ 28,500 $ 17,300