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Goodwill (Tables) | 3 Months Ended
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Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Value of Goodwill by Operating Segment | three months ended March 31, 2018 are as follows:
(in thousands) | Retail |  | National Programs |  | Wholesale Brokerage |  | Services |  | Total
Balance as of January 1, 2018 | $ | 1,386,248 |  |  | $ | 908,472 |  |  | $ | 286,098 |  |  | $ | 135,261 |  |  | $ | 2,716,079 |
Goodwill of acquired businesses | 31,356 |  |  | — |  |  | 11 |  |  | — |  |  | 31,367 |
Balance as of March 31, 2018 | $ | 1,417,604 |  |  | $ | 908,472 |  |  | $ | 286,109 |  |  | $ | 135,261 |  |  | $ | 2,747,446 |

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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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