Property, Plant and Equipment (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 3,759,973	$ 2,155,707
Depreciation	126,300	87,900	$ 90,500
Capitalized interest costs	18,400	17,000	$ 1,000
Use Rights [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 106,200	$ 76,800
Useful life property, plant and equipment (in years)	20 years