Fair value measurements (Tables)

6 Months Ended

Jun. 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 six months ended June 30, 2018.

(in thousands)
Balance at December 31, 2017	$	12,274
Expense included in earnings		1,674
Settlements		(1,257	)
Balance at June 30, 2018	$	12,691