Revenue Recognition (Net Provider Payments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenue Recognition [Abstract]
Revenues, net of provider payments	$ 2.1	$ 2.5	$ 4.7	$ 5.8