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Goodwill (Tables) | 9 Months Ended
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Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Value of Goodwill by Operating Segment | nine months ended September 30, 2017 are as follows:
(in thousands) | Retail |  | National Programs |  | Wholesale Brokerage |  | Services |  | Total
Balance as of January 1, 2017 | $ | 1,354,667 |  |  | $ | 901,294 |  |  | $ | 284,869 |  |  | $ | 134,572 |  |  | $ | 2,675,402 |
Goodwill of acquired businesses | 18,807 |  |  | 7,314 |  |  | 770 |  |  | 689 |  |  | 27,580 |
Goodwill disposed of relating to sales of businesses | (1,494 | ) |  | — |  |  | — |  |  | — |  |  | (1,494 | )
Balance as of September 30, 2017 | $ | 1,371,980 |  |  | $ | 908,608 |  |  | $ | 285,639 |  |  | $ | 135,261 |  |  | $ | 2,701,488 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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