Annual report pursuant to Section 13 and 15(d)

Goodwill And Intangible Assets (Schedule Of Intangible Assets) (Details)

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Goodwill And Intangible Assets (Schedule Of Intangible Assets) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
years
Dec. 31, 2010
years
Dec. 31, 2009
Finite-Lived Intangible Assets [Line Items]      
Intangible assets $ 47,276 $ 44,414  
Total accumulated amortization (19,846) (15,305)  
Intangible Assets, Net, Total 27,430 29,109  
Weighted Average Life in Years 9.0 8.9  
Amortization expenses 5,561 4,119 3,692
Purchased Contract Rights [Member]
     
Finite-Lived Intangible Assets [Line Items]      
Intangible assets 21,988 20,185  
Total accumulated amortization (8,554) (7,053)  
Weighted Average Life in Years 7.5 6.9  
Provider Contracts [Member]
     
Finite-Lived Intangible Assets [Line Items]      
Intangible assets 2,737 2,578  
Total accumulated amortization (931) (697)  
Weighted Average Life in Years 9.8 10.0  
Customer Relationships [Member]
     
Finite-Lived Intangible Assets [Line Items]      
Intangible assets 16,056 16,056  
Total accumulated amortization (8,753) (6,278)  
Weighted Average Life in Years 7.9 7.7  
Trade Names [Member]
     
Finite-Lived Intangible Assets [Line Items]      
Intangible assets 6,495 5,595  
Total accumulated amortization $ (1,608) $ (1,277)  
Weighted Average Life in Years 16.3 18.9