Employee benefit plan (Details) - Schedule of substantially funded - USD ($) $ in Thousands	Jul. 31, 2016	Dec. 31, 2015	Jul. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of substantially funded [Abstract]
Total Assets	$ 111,821	$ 2,149	$ 68,394	$ 2,132	$ 2,531
Accumulated Benefit Obligation		$ 2,397		$ 2,421	$ 2,697
Funded status		90.00%		88.00%	94.00%