Income taxes (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)
Tax expense recognized in OCI	$ 570	$ 570
Income Tax Expense (Benefit)	(303)	(303)
Accrued expenses and other current liabilities
Accrued income tax provision	$ 300	$ 300