Commitments And Contingencies (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2013 item lawsuit	Dec. 31, 2006 item	Apr. 01, 2013 lawsuit item	Aug. 31, 2012	Jan. 28, 2011 item
Commitments And Contingencies [Abstract]
Loss contingency patents allegedly infringed number	7	6
Loss contingency patents found not infringed number		5
Number of patents rejected from the lawsuit on grounds of obviousness					1
Number of patents remaining from original lawsuit	2
Number of new lawsuits filed by plaintiff naming customers of entity as defendants	2
Number of new lawsuits filed by plaintiff which entity joined as defendant	1
Number of lawsuits transferred to U.S. District Court			8
Number of child patents allegedly infringed			12
Fine, per month, per ATM, for terms of Settlement Agreement not met by deadline				$ 50