GOODWILL AND INTANGIBLE ASSETS Goodwill by operating and reportable segment (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of Goodwill by Operating and Reportable Segment [Line Items]
Goodwill	$ 350,810	$ 312,387	$ 312,387
Goodwill, Acquired During Period	38,423
Infusion Services [Member]
Schedule of Goodwill by Operating and Reportable Segment [Line Items]
Goodwill	304,282	265,859	265,859
Goodwill, Acquired During Period	38,423
Home Health Services [Member]
Schedule of Goodwill by Operating and Reportable Segment [Line Items]
Goodwill	33,784	33,784	33,784
Goodwill, Acquired During Period	0
PBM Services [Member]
Schedule of Goodwill by Operating and Reportable Segment [Line Items]
Goodwill	12,744	12,744	12,744
Goodwill, Acquired During Period	$ 0