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Long-term debt - Schedule of Long-term Debt Consisting of Advances (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Long-term debt $ 60,354 $ 33,140
August 2014 [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 3.44%  
Long-term debt   133
March 2015 [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 3.48%  
Long-term debt   40
March 2015 [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 4.67%  
Long-term debt   257
November 2015 [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 4.86%  
Long-term debt $ 23 166
February 2016 [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 4.86%  
Long-term debt $ 23 166
February 2016 [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 4.99%  
Long-term debt $ 510 918
February 2017 [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 2.36%  
Long-term debt $ 6,500 6,500
September 2017 [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 3.83%  
Long-term debt $ 269 377
April 2018 [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 1.27%  
Long-term debt $ 10,000  
December 2019 [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 1.98%  
Long-term debt $ 3,000 3,000
December 2019 [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 1.78%  
Long-term debt $ 6,300 6,300
December 2019 [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 1.62%  
Long-term debt $ 10,000  
June 2020 [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 1.74%  
Long-term debt $ 5,000  
December 2020 [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 1.84%  
Long-term debt $ 5,000  
March 2023 [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 4.69%  
Long-term debt $ 13,729 $ 15,283