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GOODWILL AND INTANGIBLE ASSETS Goodwill by operating and reportable segment (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2014
Goodwill
Beginning Balance	$ 571,337,000us-gaap_Goodwill	$ 317,026,000us-gaap_Goodwill
Acquisitions		254,304,000us-gaap_GoodwillAcquiredDuringPeriod
Other adjustments	1,986,000us-gaap_GoodwillOtherChanges	7,000us-gaap_GoodwillOtherChanges
Ending Balance	573,323,000us-gaap_Goodwill	571,337,000us-gaap_Goodwill
Impairment of goodwill	0us-gaap_GoodwillImpairmentLoss
Infusion Services
Goodwill
Beginning Balance	558,593,000	304,282,000
Acquisitions		254,304,000
Other adjustments	1,986,000	7,000
Ending Balance	560,579,000	558,593,000
PBM Services
Goodwill
Beginning Balance	12,744,000		12,744,000
Other adjustments	0
Ending Balance	12,744,000		12,744,000
Home Health Services
Goodwill
Goodwill included in non-current assets of discontinued operations		$ 33,800,000		$ 33,784,000