Summary of Significant Accounting Policies Goodwill (Details) (USD $)	3 Months Ended		6 Months Ended			3 Months Ended			3 Months Ended			3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 Grid [Member] Goodwill [Member]	Mar. 31, 2014 Grid [Member] Goodwill [Member]	Dec. 31, 2013 Grid [Member] Goodwill [Member]	Jun. 30, 2014 Grid [Member] Accumulated impairment losses [Member]	Mar. 31, 2014 Grid [Member] Accumulated impairment losses [Member]	Dec. 31, 2013 Grid [Member] Accumulated impairment losses [Member]	Jun. 30, 2014 Grid [Member] Goodwill, net [Member]	Mar. 31, 2014 Grid [Member] Goodwill, net [Member]	Dec. 31, 2013 Grid [Member] Goodwill, net [Member]
Goodwill [Line Items]
Goodwill, Gross						$ 3,388,000	$ 3,388,000	$ 3,388,000
Accumulated impairment loss									3,388,000	0	0
Goodwill, Acquired During Period						0	0		0	0		0	0
Goodwill, Impairment Loss	3,388,000	0	3,388,000	0		0	0			0		(3,388,000)	0
Goodwill	$ 4,985,000		$ 4,985,000		$ 8,390,000							$ 0	$ 3,388,000	$ 3,388,000