Revenue Recognition (Schedule Of Medicare Cap Liability Activity) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Revenue Recognition [Abstract]
Beginning balance January 1,	$ 1,261	$ 2,965
2013 measurement period	3,161
2012 measurement period		(2,577)
Ending balance September 30,	$ 4,422	$ 388