Contingencies and Healthcare Regulation (Professional and General Liability Insurance) (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2010
Professional and general liability insurance [Member]
Self Insurance Reserve [Line Items]
Third party maximum coverage amount	$ 65,000,000
Annual self-insured retention amount			15,000,000		10,000,000
Increase (decrease) in self insurance reserve		(5,800,000)	(6,200,000)	7,000,000
Increase (decrease) in self insurance reserve, net of taxes		(3,600,000)	(3,800,000)	4,300,000
Increase (decrease) in self insurance reserve, per diluted share		$ (0.05)	$ (0.05)	$ 0.06
Workers compensation insurance [Member]
Self Insurance Reserve [Line Items]
Increase (decrease) in self insurance reserve			(2,200,000)	(500,000)
Increase (decrease) in self insurance reserve, net of taxes			$ (1,300,000)	$ (300,000)
Increase (decrease) in self insurance reserve, per diluted share			$ (0.02)	$ (0.01)