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Goodwill and Other Intangible Assets, Net (Tables) | 9 Months Ended
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Sep. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract] |
Components of Goodwill and Other Intangible Assets, Net | The components of goodwill and other intangible assets, net, at September 30, 2018 and December 31, 2017 were as follows (in thousands):
|  | September 30, |  |  | December 31, |
|  | 2018 |  |  | 2017 |
Goodwill |  | $ | 560,712 |  |  | $ | 528,424 |
Intangible assets: |  |  |  |  |  |  |  |
Client lists |  |  | 180,320 |  |  |  | 177,221 |
Other intangible assets |  |  | 9,368 |  |  |  | 8,767 |
Total intangible assets |  |  | 189,688 |  |  |  | 185,988 |
Total goodwill and intangibles assets |  |  | 750,400 |  |  |  | 714,412 |
Accumulated amortization: |  |  |  |  |  |  |  |
Client lists |  |  | (109,105 | ) |  |  | (97,063 | )
Other intangible assets |  |  | (5,093 | ) |  |  | (4,143 | )
Total accumulated amortization |  |  | (114,198 | ) |  |  | (101,206 | )
Goodwill and other intangible assets, net |  | $ | 636,202 |  |  | $ | 613,206 |

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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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