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Fair Value of Financial Instruments (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Carrying Amount [Member]
   
Assets:    
Note receivable from CareCentrix $ 25,000 $ 25,000
Seller financing note receivable from CareCentrix 3,471 0
Liabilities:    
Long-term obligation 935,182 988,125
Estimate Fair Value [Member]
   
Assets:    
Note receivable from CareCentrix 25,220 26,600
Seller financing note receivable from CareCentrix 3,471 0
Liabilities:    
Long-term obligation $ 912,818 $ 863,313