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Fair Value of Financial Instruments (Details 1) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Carrying Amount [Member]
   
Assets:    
Note receivable from CareCentrix $ 25,000 $ 25,000
Seller financing note receivable from CareCentrix 3,471 3,471
Liabilities:    
Long-term obligation 910,182 935,182
Estimate Fair Value [Member]
   
Assets:    
Note receivable from CareCentrix 26,749 25,220
Seller financing note receivable from CareCentrix 3,471 3,471
Liabilities:    
Long-term obligation $ 922,470 $ 912,818