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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2018
Industry Vertical [Member] |
Disaggregation of Revenue [Line Items] |
Disaggregation of Revenue [Table Text Block] | The following table presents revenue disaggregated by client industry vertical for the twelve months ended December 31, 2018, 2017, and 2016 and the impact of adoption of ASC 606:
| Twelve Months Ended December 31,
| 2018 |  | 2017 |  | 2016
Industry | Reportable Segment |  | As reported |  | Adjustment to exclude impact of Adoption of ASC 606 |  | Adjusted |  |  |  |
Food & Beverage | All |  | $ | 313,368 |  |  | $ | 7,064 |  |  | $ | 320,432 |  |  | $ | 313,786 |  |  | $ | 266,600 |
Retail | All |  | 152,552 |  |  | (2,683 | ) |  | 149,869 |  |  | 178,152 |  |  | 182,428 |
Consumer Products | All |  | 162,524 |  |  | 585 |  |  | 163,109 |  |  | 162,307 |  |  | 147,849 |
Communications | All |  | 178,410 |  |  | 25,957 |  |  | 204,367 |  |  | 208,701 |  |  | 160,064 |
Automotive | All |  | 88,807 |  |  | 8,587 |  |  | 97,394 |  |  | 127,023 |  |  | 129,352 |
Technology | All |  | 104,479 |  |  | 38 |  |  | 104,517 |  |  | 99,325 |  |  | 109,309 |
Healthcare | All |  | 127,547 |  |  | 507 |  |  | 128,054 |  |  | 124,261 |  |  | 115,159 |
Financials | All |  | 110,069 |  |  | 146 |  |  | 110,215 |  |  | 104,713 |  |  | 85,480 |
Transportation and Travel/Lodging | All |  | 86,419 |  |  | 2,461 |  |  | 88,880 |  |  | 56,955 |  |  | 58,298 |
Other | All |  | 152,028 |  |  | 8,974 |  |  | 161,002 |  |  | 138,556 |  |  | 131,246 |
|  |  | $ | 1,476,203 |  |  | $ | 51,636 |  |  | $ | 1,527,839 |  |  | $ | 1,513,779 |  |  | $ | 1,385,785 |
By Location [Member] |
Disaggregation of Revenue [Line Items] |
Disaggregation of Revenue [Table Text Block] | The following table presents revenue disaggregated by geography for the twelve months ended December 31, 2018, 2017, and 2016 and the impact of adoption of ASC 606:
| Twelve Months Ended December 31,
| 2018 |  | 2017 |  | 2016
Geographic Location | Reportable Segment |  | As reported |  | Adjustment to exclude impact of Adoption of ASC 606 |  | Adjusted |  |  |  |
United States | All |  | $ | 1,153,192 |  |  | $ | 20,699 |  |  | $ | 1,173,891 |  |  | $ | 1,172,364 |  |  | $ | 1,103,714 |
Canada | All |  | 124,000 |  |  | (1,288 | ) |  | 122,712 |  |  | 123,092 |  |  | 124,101 |
Other | All, Excluding Domestic Creative Agencies |  | 199,011 |  |  | 32,225 |  |  | 231,236 |  |  | 218,323 |  |  | 157,970 |
|  |  | $ | 1,476,203 |  |  | $ | 51,636 |  |  | $ | 1,527,839 |  |  | $ | 1,513,779 |  |  | $ | 1,385,785 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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