Contingencies (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Jan. 22, 2008	Oct. 04, 2007 Hospital
Contingencies Additional (Textual) [Abstract]
Number of New Mexico hospitals violated the norms under Federal False Claims Act			3
Civil Division notified that hospitals received ineligible federal participation payments		$ 27.5
Period to intervene and to act as plaintiff by government	60 days
Requested shorter period of time	90 days
Accrued estimated losses of legal matters	$ 21.3
Reuille [Member]
Contingencies (Textual) [Abstract]
Period of stay in litigation	180 days
Additional period of stay in litigation	180 days