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Fair Value Measurements - Schedule of fair value on a recurring basis (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Fair Value, Inputs, Level 1 [Member]    
Assets:    
Money market funds $ 3,233 $ 481
Mutual funds 15,097  
Fair Value, Inputs, Level 2 [Member]    
Assets:    
Short-term investments 78,371  
Company-owned life insurance   10,464
Fair Value, Inputs, Level 3 [Member]    
Liabilities:    
Contingent consideration $ 4,475 $ 20,039