Schedule of Company's Share of Revenues and Operating Income Earned from the Joint Ventures in Which it is Invested (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Equity Method Investments And Joint Ventures [Abstract]
Revenues	$ 1,007	$ 2,177
Operating income	$ 286	$ 143