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Goodwill (Schedule Of Goodwill) (Details) (USD $)
In Thousands
0 Months Ended9 Months Ended
Nov. 30, 2010
Sep. 30, 2011
Sep. 30, 2011
Retail [Member]
Sep. 30, 2011
National Programs [Member]
Sep. 30, 2011
Wholesale Brokerage [Member]
Sep. 30, 2011
Services [Member]
Dec. 31, 2010
Services [Member]
Goodwill [Line Items]       
Beginning Balance $ 1,194,827$ 716,626$ 152,601$ 257,360$ 68,240$ 68,240
Goodwill of acquired businesses 78,02275,7332,289   
Goodwill transferred  (1,771) 1,771  
Goodwill disposed of relating to sales of businesses (3,892)(3,892)    
Ending Balance 1,268,957786,696154,890259,13168,24068,240
Goodwill impairment$ 0$ 0