Commitments And Contingencies (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Aug. 31, 2012 Class Action Litigation [Member] claim	Nov. 30, 2010 Song-Beverly Credit Card Act [Member] claim
Number of class action lawsuits		2	4
Civil penalty for violation of the act maximum first time violation	$ 250
Civil penalty for violation of act, each subsequent transaction	1,000
Loss contingency, estimated reasonably possible loss amount	$ 15,000,000
Time period preceding filing of class action lawsuit including employees	4 years