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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Fair Value, Liabilities Measured on Recurring Basis [Table Text Block]
The reconciliation of the beginning and ending balances for level 3 measurements is as follows (in thousands):
 
Carrying Value
 
Estimated Fair Value
Contingent consideration liability, balance as of December 31, 2018
$
2,207

 
$
2,207

Payment of contingent consideration
(514
)
 
(514
)
Payment of contingent consideration in excess of acquisition date fair value
(1,332
)
 
(1,332
)
Change in fair value of contingent consideration
257

 
257

Contingent consideration liability, balance as of June 30, 2019
$
618

 
$
618