Revenue Recognition (Narrative) (Details) (USD $)	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2011	Dec. 31, 2010
Revenue Recognition [Abstract]
Unbilled revenue		$ 1,100,000	$ 2,800,000
Medicare cap liability	$ 384,000