Revenue Recognition (Schedule Of Medicare Cap Liability Activity) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Revenue Recognition [Abstract]
Beginning balance January 1,	$ 2,965	$ 1,371
Reversal - 2012 measurement period	(2,577)
Expense - 2011 measurement period		299
Reversal - 2011 measurement period		(743)
Other		(198)
Ending balance June 30,	$ 388	$ 729