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Revenue Recognition (Schedule Of Medicare Cap Liability Activity) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Revenue Recognition [Abstract]    
Beginning Balance January 1, $ 235 $ 1,165
Prior measurment periods 247  
Payments (618)
Ending Balance June 30, $ 482 $ 547