Acquisitions and Divestitures (Schedule of Net Operating Revenues and Losses from Discontinued Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011
Acquisitions And Divestitures [Abstract]
Net operating revenues			$ 144,546
Gain (loss) from operations of entities sold before income taxes		(729)	(12,390)
Impairment of hospitals sold			(51,695)
Loss on sale, net			(4,301)
Loss from discontinued operations, before taxes		(729)	(68,386)
Income tax expense (benefit)		(263)	(10,115)
Loss from discontinued operations, net of taxes	$ (466)	$ (466)	$ (58,271)