Litigation Contingencies (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended	1 Months Ended
	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2009	Jun. 30, 2012	Aug. 31, 2011 Class Settlement Fund [Member]	Jun. 30, 2011 Class Settlement Fund [Member]
Litigation Contingencies (Textual) [Abstract]
Shoppers paid						$ 7.0
Unclaimed fund revert					1.3
Litigation Contingencies (Additional Textual) [Abstract]
Accrued litigation contingencies			7.0
Reduction in accrual	$ 0.5	$ 0.8
Loss contingency, settlement agreement, date				January 25, 2010