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Accrued Professional Liability (Schedule Of Accrued Professional Liability) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Accrued Professional Liability [Abstract]      
Balance at beginning of year $ 40,672 $ 41,355 $ 36,366
Provision (adjustment) for losses related to Current year 18,645 17,256 16,497
Provision (adjustment) for losses related to Prior years (4,283) (4,029) (3,519)
Total provision for losses 14,362 13,227 12,978
Claim payments related to Current year (221) (553) (568)
Claim payments related to Prior years (11,526) (13,357) (7,421)
Total payments (11,747) (13,910) (7,989)
Balance at end of year $ 43,287 $ 40,672 $ 41,355