Leases (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Capital Leased Assets [Line Items]
Lease rent expenses	$ 7.8	$ 2.6	$ 1.9
Minimum
Capital Leased Assets [Line Items]
Capital lease interest rate	2.00%
Maximum
Capital Leased Assets [Line Items]
Capital lease interest rate	7.00%