XML 47 R53.htm IDEA: XBRL DOCUMENT v2.4.0.6
Accrued Professional Liability (Narrative) (Details) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Accrued Professional Liability [Abstract]        
Total accrued professional liability $ 122,800,000 $ 111,700,000    
Accrued professional liability incurred but loss reserves not reported for claims 79,500,000 71,000,000    
Accrued professional liability incurred and loss reserves reported for claims 43,287,000 40,672,000 41,355,000 36,366,000
Increase in accrued professional liability incurred but not reported loss reserves $ 8,500,000 $ 2,800,000