GOODWILL AND OTHER INTANGIBLE ASSETS (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Amortized other intangible assets [Abstract]
Gross carrying amount	$ 675,511,000	$ 658,311,000
Accumulated amortization	442,819,000	376,678,000
Net carrying amount	232,692,000	281,633,000
Unamortized other intangible assets [Abstract]
Gross carrying amount	85,900,000	85,900,000
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross carrying amount	761,411,000	744,211,000
Net carrying amount	318,592,000	367,533,000
Weighted-average amortization period (in years)	10 years	10 years
Amortization expense	74,100,000	64,400,000	64,100,000
Future Estimated Intangible Amortization Expense [Abstract]
2013	66,100,000
2014	65,600,000
2015	32,200,000
2016	16,600,000
2017	13,300,000
Impairment of Intangible Assets (Excluding Goodwill) [Abstract]
Impairment of Intangible Assets (Excluding Goodwill)	7,700,000
Trade Names [Member]
Amortized other intangible assets [Abstract]
Accumulated amortization	0	0
Unamortized other intangible assets [Abstract]
Gross carrying amount	85,900,000	85,900,000
Customer Lists [Member]
Amortized other intangible assets [Abstract]
Gross carrying amount	596,162,000	579,062,000
Accumulated amortization	406,272,000	344,111,000
Net carrying amount	189,890,000	234,951,000
HMO Licenses [Member]
Amortized other intangible assets [Abstract]
Gross carrying amount	12,600,000	12,600,000
Accumulated amortization	8,907,000	8,312,000
Net carrying amount	3,693,000	4,288,000
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Amortization period (in years)	20 years	20 years
Provider Network [Member]
Amortized other intangible assets [Abstract]
Gross carrying amount	63,300,000	63,200,000
Accumulated amortization	24,191,000	20,895,000
Net carrying amount	39,109,000	42,305,000
Trade Names [Member]
Amortized other intangible assets [Abstract]
Gross carrying amount	3,449,000	3,449,000
Accumulated amortization	3,449,000	3,360,000
Net carrying amount	$ 0	$ 89,000
Minimum [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Amortization period (in years)	3 years
Minimum [Member] | Customer Lists [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Amortization period (in years)	7 years	7 years
Minimum [Member] | Provider Network [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Amortization period (in years)	15 years	15 years
Minimum [Member] | Trade Names [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Amortization period (in years)	3 years	3 years
Maximum [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Amortization period (in years)	20 years
Maximum [Member] | Customer Lists [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Amortization period (in years)	15 years	15 years
Maximum [Member] | Provider Network [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Amortization period (in years)	20 years	20 years
Maximum [Member] | Trade Names [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Amortization period (in years)	4 years	4 years