Manufactured Methane (Manufactured Methane Facilities) (Details) - Methane Project [Member] - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Manufactured Methane facilities, at cost	$ 1,634	$ 1,634
Accumulated depreciation	(45)
Manufactured Methane facilities, net	$ 1,589	$ 1,634