Basis of Presentation and Revenue Recognition (Tables)

9 Months Ended

Sep. 30, 2015

Basis of Presentation and Revenue Recognition [Abstract]

Percentage of revenue by major customers

For the three and nine months ended September 30, 2015 and 2014, the following customers provided more than 10% of the Company's consolidated revenue:

	Three Months ended September 30,		Nine Months ended September 30,
	2015	2014	2015	2014
Tennessee Valley Authority	14.3 %	0.0 %	17.9 %	0.0 %
Public Service Enterprise Group Inc.	11.3 %	0.6 %	10.6 %	0.6 %