Summary of Significant Accounting Policies Acquistion (Details) (Etrinity [Member], USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended
	Jan. 31, 2013	Dec. 31, 2012
Etrinity [Member]
Business Acquisition [Line Items]
Cost of acquired entity, purchase price	$ 2.8
Goodwill acquired	2.2
Revenues		$ 3