Patent Sale (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Patent Sale Narrative Details
Sale of patents	$ 1.0	$ 0	$ 12.0
Future maximum patent license collection	$ 2.0