Shareholders' Equity (Stock Repurchases) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Jan. 01, 2012
Equity, Class of Treasury Stock [Line Items]
Purchase of treasury shares	$ 8,666,000	$ 74,982,000
Shares repurchased	57,457
July 2011 Stock Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Number of shares to be repurchased under stock repurchase program	100,000,000
Shares of common stock repurchased		3,900,000
Purchase of treasury shares		75,000,000
Residential Treatment Services
Equity, Class of Treasury Stock [Line Items]
Shares of common stock repurchased	295,959
Purchase of treasury shares	$ 8,600,000
Residential Treatment Services | July 2011 Stock Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Shares of common stock repurchased	295,959