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Fair Value Measurements - Schedule of fair value on a recurring basis (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Fair Value, Inputs, Level 1 [Member]    
Assets:    
Money market funds $ 2,454 $ 481
Fair Value, Inputs, Level 2 [Member]    
Assets:    
Short-term investments 86,223 0 [1]
Company-owned life insurance 11,787 10,464
Fair Value, Inputs, Level 3 [Member]    
Liabilities:    
Contingent consideration $ 15,069 $ 20,039
[1] Investments were measured at carrying value as of December 31, 2018. See table below.