Goodwill and Other Intangible Assets (Details) (USD $)			3 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Shoppers
Goodwill and Other Intangible Assets
Goodwill	$ 398,164,000	$ 398,164,000
Other intangible assets	2,344,000	5,259,000
Intangible Assets
Non-cash trade name intangible asset impairment charge			$ 2,800,000