BUSINESS ACQUISITIONS (Details)	6 Months Ended
	Jun. 30, 2013 Put Option [Member]	Jun. 30, 2013 Call Option [Member]	Jan. 02, 2013 UMass Memorial Medical Center (UMass) [Member]
Business Acquisitions [Line Items]
Percentage of equity interest expected to be divested			18.90%
Vesting period for derivative instrument	2 years	2 years