CONTINGENCIES (Details) (USD $)	3 Months Ended
	Mar. 31, 2013 Number_of_Shareholders Number_of_Officers
Putative Securities Class Action Lawsuit [Member]
Loss Contingencies [Line Items]
Number of current and former officers named in legal matter	3
Number of additional shareholders filing similar motions	3
Company self insured rentention	$ 2,500,000
Total number of shareholders in legal matter	4
Putative ERISA Class Action Lawsuit [Member]
Loss Contingencies [Line Items]
Number of former employees that filed lawsuit	2
Number of additional actions filed in legal matter	3
Putative Securities Class Action Lawsuit Related to Aetna Deal - Circuit Court for Montgomery County, Maryland [Member]
Loss Contingencies [Line Items]
Total number of shareholders in legal matter	3
Putative Securities Class Action Lawsuit Related to Aetna Deal - Court of Chancery of the State of Delaware [Member]
Loss Contingencies [Line Items]
Original termination fee	167,500,000
New Termination Fee	$ 100,000,000
Total number of shareholders in legal matter	4