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Long-term debt - Additional Information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]  
Long-term debt, fixed rates amount $ 48,834
Long-term debt, adjustable rates amount $ 9,300
Long-term debt, Libor interest rate description three-month Libor plus 1.21% to plus 1.57%
Minimum  
Debt Instrument [Line Items]  
Long-term debt, Libor interest rate percentage 1.21%
Maximum  
Debt Instrument [Line Items]  
Long-term debt, Libor interest rate percentage 1.57%