Acquisitions And Divestitures (Schedule Of Results Of Operations For The Former PSI Facilities, On A Combined Basis, Reflected As Discontinued Operations) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Acquisitions And Divestitures [Abstract]
Net revenues	$ 33,884	$ 4,155
Income from discontinued operations	7,904	859
Gain on divestiture	442
Income from discontinued operations, before income tax expense	8,346	859
Income tax expense	(3,160)	(318)
Income from discontinued operations, net of income tax expense	$ 5,186	$ 541