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Segment Information (Summarized Financial Information Of Reportable Segments) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Segment Information [Line Items]      
Total revenues $ 302,486 $ 262,228  
Investment income 135 224  
Amortization 15,613 13,509  
Depreciation 3,641 3,135  
Interest expense 4,087 3,607  
Income before income taxes 82,790 76,670  
Total assets 3,017,447 2,443,996 2,607,011
Capital expenditures 5,905 2,917  
Retail [Member]
      
Segment Information [Line Items]      
Total revenues 167,204 157,780  
Investment income 25 16  
Amortization 8,527 8,204  
Depreciation 1,258 1,258  
Interest expense 6,934 6,914  
Income before income taxes 42,200 38,978  
Total assets 2,188,467 2,002,677  
Capital expenditures 1,061 1,292  
National Programs [Member]
      
Segment Information [Line Items]      
Total revenues 64,607 46,594  
Amortization 3,176 1,924  
Depreciation 1,142 785  
Interest expense 6,652 451  
Income before income taxes 15,957 20,017  
Total assets 1,154,666 632,207  
Capital expenditures 2,416 427  
Wholesale Brokerage [Member]
      
Segment Information [Line Items]      
Total revenues 43,304 41,824  
Investment income 6 8  
Amortization 2,787 2,734  
Depreciation 656 665  
Interest expense 1,226 2,217  
Income before income taxes 8,877 7,777  
Total assets 768,444 694,364  
Capital expenditures 1,174 633  
Services [Member]
      
Segment Information [Line Items]      
Total revenues 25,830 15,846  
Investment income   3  
Amortization 1,113 637  
Depreciation 225 132  
Interest expense 1,520 1,509  
Income before income taxes 2,987 1,731  
Total assets 269,623 145,560  
Capital expenditures 361 295  
Other [Member]
      
Segment Information [Line Items]      
Total revenues 1,541 184  
Investment income 104 197  
Amortization 10 10  
Depreciation 360 295  
Interest expense (12,245) (7,484)  
Income before income taxes 12,769 8,167  
Total assets (1,363,753) (1,030,812)  
Capital expenditures $ 893 $ 270