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Fair value measurements (Tables)
 9 Months Ended
Sep. 30, 2018
Fair value measurements [Abstract]  
Reconciliation of Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3)
The following table is a reconciliation of the beginning and ending balance of the liabilities, consisting only of contingent consideration, measured at fair value, using significant unobservable inputs (Level 3) during the nine months ended September 30, 2018.

(in thousands)
   
Balance at December 31, 2017
 
$
12,274
 
Expense included in earnings
  
1,917
 
Settlements
  
(2,234
)
Balance at September 30, 2018
 
$
11,957