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Summary of significant accounting policies (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Significant Accounting Policies [Line Items]        
Foreign Currency Transaction Gain (Loss), before Tax     $ 3,373 $ 1,404
Weighted Average Number of Shares Outstanding, Diluted 25,147,286 27,986,839 24,975,165 24,276,947
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 3,927,132 3,675,640 3,419,463 3,299,989
Other Nonoperating Income $ 1,417 $ 1,191 $ 5,142 $ 2,477