Leases (Details Textual) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Leases (Textual)
Right-of-use assets	$ 51,623
Current operating lease liabilities	42,808
Non-current operating lease liabilities	8,839
Operating lease payment	10,200
Leases recognized cost of revenues	9,800
General administrative expenses	$ 400