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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Value of Goodwill by Operating Segment | The changes in the carrying value of goodwill by reportable segment for the years ended December 31, are as follows:
(in thousands) | Retail |  | National Programs |  | Wholesale Brokerage |  | Services |  | Total
Balance as of January 1, 2016 | $ | 1,345,636 |  |  | $ | 901,866 |  |  | $ | 226,961 |  |  | $ | 112,220 |  |  | $ | 2,586,683 |
Goodwill of acquired businesses | 13,117 |  |  | (1 | ) |  | 57,908 |  |  | 22,352 |  |  | 93,376 |
Goodwill of transferred businesses | 571 |  |  | (571 | ) |  | — |  |  | — |  |  | — |
Goodwill disposed of relating to sales of businesses | (4,657 | ) |  | — |  |  | — |  |  | — |  |  | (4,657 | )
Balance as of December 31, 2016 | $ | 1,354,667 |  |  | $ | 901,294 |  |  | $ | 284,869 |  |  | $ | 134,572 |  |  | $ | 2,675,402 |
Goodwill of acquired businesses | 33,076 |  |  | 7,178 |  |  | 1,229 |  |  | 689 |  |  | 42,172 |
Goodwill disposed of relating to sales of businesses | (1,495 | ) |  | — |  |  | — |  |  | — |  |  | (1,495 | )
Balance as of December 31, 2017 | $ | 1,386,248 |  |  | $ | 908,472 |  |  | $ | 286,098 |  |  | $ | 135,261 |  |  | $ | 2,716,079 |

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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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