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Segment Information (Summarized Financial Information Reportable Segments) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Segment Reporting Information [Line Items]                      
Total revenues $ 244,097 $ 260,401 $ 246,816 $ 262,228 $ 229,938 $ 247,616 $ 243,665 $ 252,273 $ 1,013,542 $ 973,492 $ 967,877
Investment income                 1,267 1,326 1,161
Amortization                 54,755 51,442 49,857
Depreciation                 12,392 12,639 13,240
Interest expense                 14,132 14,471 14,599
Income before income taxes                 270,521 266,098 254,754
Total assets 2,607,011       2,400,814       2,607,011 2,400,814 2,224,226
Capital expenditures                 13,608 10,454 11,310
Retail [Member]
                      
Segment Reporting Information [Line Items]                      
Total revenues                 607,199 575,061 583,374
Investment income                 102 170 282
Amortization                 33,373 30,725 29,943
Depreciation                 5,046 5,349 6,060
Interest expense                 27,688 27,037 31,596
Income before income taxes                 137,807 128,026 121,769
Total assets 2,155,413       1,914,587       2,155,413 1,914,587 1,764,249
Capital expenditures                 6,102 4,852 3,459
National Programs [Member]
                      
Segment Reporting Information [Line Items]                      
Total revenues                 181,277 189,165 190,593
Investment income                   1 3
Amortization                 8,630 9,213 9,175
Depreciation                 2,994 3,049 2,725
Interest expense                 1,794 3,242 5,365
Income before income taxes                 67,588 74,941 70,436
Total assets 734,423       667,123       734,423 667,123 627,392
Capital expenditures                 2,079 2,432 4,318
Wholesale Brokerage [Member]
                      
Segment Reporting Information [Line Items]                      
Total revenues                 157,308 158,699 158,341
Investment income                 34 29 62
Amortization                 10,172 10,201 10,239
Depreciation                 2,537 2,695 2,894
Interest expense                 7,082 10,770 14,289
Income before income taxes                 29,388 25,234 17,030
Total assets 658,040       631,344       658,040 631,344 618,704
Capital expenditures                 2,547 1,838 3,201
Services [Member]
                      
Segment Reporting Information [Line Items]                      
Total revenues                 65,972 46,447 32,743
Investment income                 128 15 23
Amortization                 2,541 1,264 462
Depreciation                 590 352 333
Interest expense                 5,746 2,592 668
Income before income taxes                 7,729 7,693 6,996
Total assets 166,060       145,321       166,060 145,321 47,829
Capital expenditures                 689 419 160
Other [Member]
                      
Segment Reporting Information [Line Items]                      
Total revenues                 1,786 4,120 2,826
Investment income                 1,003 1,111 791
Amortization                 39 39 38
Depreciation                 1,225 1,194 1,228
Interest expense                 (28,178) (29,170) (37,319)
Income before income taxes                 28,009 30,204 38,523
Total assets (1,106,925)       (957,561)       (1,106,925) (957,561) (833,948)
Capital expenditures                 $ 2,191 $ 913 $ 172