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Income taxes (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
U.S. Federal	$ 0	$ 0	$ 0
U.S. State and Local	(2)	(2)	4,890
Foreign	(766)	(483)	(197)
Deferred:
U.S. Federal	199	0	0
U.S. State and Local	0	0	0
Foreign	0	0	0
Total Tax (Expense) Benefit	$ (569)	$ (485)	$ 4,693

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