Revenue Recognition and Valuation Accounts (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Revenue Recognition and Valuation Accounts (Textual) [Abstract]
Allowance for doubtful accounts	$ 0.1		$ 0.1
Allowance for contractual discounts	57.5		54.6
Allowance for uncompensated care	49.3	42.0	48.0
Value of uncompensated care to patients	1.8	0.7
Estimated cost of charity services	0.7	0.3
Contractual period of services	3 years
Contract termination period	90 days
Termination fee	13.5
Inventory valuation reserves	$ 12.7		$ 12.4