Basis of Presentation (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Basis of Presentation [Abstract]
Number of weeks in fiscal period, minimum (in weeks)	52		52
Number of weeks in fiscal period, maximum (in weeks)	53		53
Number of weeks in first quarter (in weeks)	13	13
Number of weeks year to date (in weeks)			26	26