Summary Of Significant Accounting Policies (Schedule Of Amortization Period For Intangible Assets) (Details)	12 Months Ended
	Dec. 31, 2011 years
Purchased Contract Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Amortization Period, Minimum	5
Intangible Assets, Amortization Period, Maximum	15
Provider Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Amortization Period, Minimum	7
Intangible Assets, Amortization Period, Maximum	10
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Amortization Period, Minimum	5
Intangible Assets, Amortization Period, Maximum	15
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Amortization Period, Minimum	7
Intangible Assets, Amortization Period, Maximum	20