CLAIMS AND LAWSUITS (Details) (USD $)					1 Months Ended					9 Months Ended		1 Months Ended	3 Months Ended			0 Months Ended	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011	Jan. 31, 2013 Governmental Reviews	Sep. 30, 2010 Governmental Reviews hospital	Jul. 31, 2010 Governmental Reviews hospital	Mar. 31, 2010 Governmental Reviews hospital	Mar. 31, 2009 Governmental Reviews hospital	Sep. 30, 2013 Governmental Reviews hospital	Sep. 30, 2012 Governmental Reviews hospital	Aug. 31, 2013 Hospital-Related Tort Claim	Sep. 30, 2013 Hospital-Related Tort Claim	Dec. 31, 2011 Hospital-Related Tort Claim	Jun. 24, 2013 Vanguard Acquisition Lawsuits Vanguard	Aug. 26, 2013 Vanguard Acquisition Lawsuits Maximum	Sep. 30, 2013 Ordinary Course Matters person	Sep. 30, 2013 Ordinary Course Matters Minimum person
Loss Contingencies
Number of hospitals which have received information requests from the DOJ regarding Kyphoplasty billing procedures							6		1
Litigation reserve	$ 11,000,000	$ 10,000,000	$ 9,000,000	$ 66,000,000						$ 3,000,000				$ 6,000,000
Number of hospitals under governmental review										3
Settlement amount					900,000							8,000,000
Damages, attorneys' fees, interest and expenses awarded to plaintiff												9,800,000
Increase in reserve													2,000,000
Number of hospitals under Medicare claims review						32		1
Number of hospitals under Medicare claims review not calculate estimate loss or range of loss											5
Number of hospitals for which review of billing practices not completed by clinical expert											3
Number of hospitals for which agreement with DOJ on appropriate review methodology has not been reached											2
Fees and expenses of the plaintiffs' counsel																$ 1,000,000
Business acquisition share price (in dollars per share)															$ 21
Number of persons in class action lawsuits																		5,000
Number of persons identified in class certification process																	8