Leases (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Right-of-use assets	$ 64,549
Current operating lease liabilities	55,434
Non-current operating lease liabilities	9,127
Operating lease payment	13,100
Leases recognized cost of revenues	12,900
General administrative expenses	$ 200