Summary of Significant Accounting Policies Goodwill (Tables)

6 Months Ended

Jun. 30, 2014

Goodwill [Line Items]

Schedule of Goodwill [Table Text Block]

The following table sets forth the balance of the Grid reporting unit’s goodwill as of June 30, 2014 and December 31, 2013 (in thousands):

	Dec 31, 2013		Additions	Impairments	March 31, 2014	Additions	Impairments		June 30, 2014
Goodwill, gross	$	3,388	—	—	3,388	—	—		$	3,388
Accumulated impairment losses	—		—	—	—	—	3,388		3,388
Total goodwill, net	$	3,388	—	—	3,388	—	(3,388	)	$	—