Goodwill and Intangible Assets (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Goodwill and Intangible Assets (Textual) [Abstract]
Future amortization expense, 2013	17,900,000
Future amortization expense, 2014	17,000,000
Future amortization expense, 2015	12,100,000
Future amortization expense, 2016	9,400,000
Future amortization expense, 2017	9,300,000
Contract rights and licenses [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Weighted average amortization period	11 years
Goodwill and Intangible Assets (Textual) [Abstract]
Amortization of other intangible assets useful lives, minimum	11 years
Customer relationships [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Weighted average amortization period	5 years
Goodwill and Intangible Assets (Textual) [Abstract]
Amortization of other intangible assets useful lives, minimum	5 years
Contract backlog [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Weighted average amortization period	2 years
Goodwill and Intangible Assets (Textual) [Abstract]
Amortization of other intangible assets useful lives, minimum	2 years
Provider networks [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Weighted average amortization period	10 years
Goodwill and Intangible Assets (Textual) [Abstract]
Amortization of other intangible assets useful lives, minimum	10 years
Minimum [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Weighted average amortization period	1 year
Goodwill and Intangible Assets (Textual) [Abstract]
Amortization of other intangible assets useful lives, minimum	1 year
Maximum [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Weighted average amortization period	15 years	15 years
Goodwill and Intangible Assets (Textual) [Abstract]
Amortization of other intangible assets useful lives, minimum	15 years	15 years