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Fair value measurements (Tables)
12 Months Ended
Dec. 31, 2017
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 measured at fair value using significant unobservable inputs (Level 3) during the years ended December 31, 2017 and 2016.

(in thousands)
   
Balance at December 31, 2015
 
$
25,155
 
(Income) expense included in earnings
  
(10,857
)
Settlements
  
(1,113
)
Balance at December 31, 2016
 
$
13,185
 
(Income) expense included in earnings
  
7,830
 
Settlements
  
(10,941
)
Purchases, sales and issuances
  
2,200
 
Balance at December 31, 2017
 
$
12,274