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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Services | $ 375,830 | $ 375,800 | $ 1,082,541 | $ 1,111,032
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 8,172 |  | 39,176 |
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 384,002 |  | 1,121,717 |
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 296,544 | 289,701 | 848,336 | 868,847
United States | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 1,899 |  | 16,940 |
United States | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 298,443 |  | 865,276 |
Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 32,132 | 31,418 | 91,597 | 88,471
Canada | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 286 |  | (2,352) |
Canada | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 32,418 |  | 89,245 |
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 47,154 | 54,681 | 142,608 | 153,714
Other | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 5,987 |  | 24,588 |
Other | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 53,141 |  | 167,196 |
Food & Beverage |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 80,919 | 80,247 | 234,203 | 225,873
Food & Beverage | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | (1,212) |  | 4,171 |
Food & Beverage | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 79,707 |  | 238,374 |
Retail |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 40,421 | 43,202 | 116,832 | 134,993
Retail | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | (4,457) |  | (2,685) |
Retail | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 35,964 |  | 114,147 |
Consumer Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 40,124 | 43,825 | 118,097 | 119,554
Consumer Products | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 1,136 |  | 362 |
Consumer Products | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 41,260 |  | 118,459 |
Communications |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 46,779 | 46,649 | 128,232 | 150,703
Communications | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 8,337 |  | 20,519 |
Communications | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 55,116 |  | 148,751 |
Automotive |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 21,282 | 30,547 | 67,070 | 96,832
Automotive | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 734 |  | 6,809 |
Automotive | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 22,016 |  | 73,879 |
Technology |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 26,005 | 25,748 | 71,085 | 72,620
Technology | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 171 |  | (139) |
Technology | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 26,176 |  | 70,946 |
Healthcare |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 33,751 | 31,181 | 101,753 | 92,380
Healthcare | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 84 |  | 603 |
Healthcare | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 33,835 |  | 102,356 |
Financials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 30,378 | 26,631 | 83,079 | 73,777
Financials | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 283 |  | 1,194 |
Financials | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 30,661 |  | 84,273 |
Transportation and Travel/Lodging |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 19,357 | 14,412 | 53,021 | 42,187
Transportation and Travel/Lodging | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 1,333 |  | 2,109 |
Transportation and Travel/Lodging | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 20,690 |  | 55,130 |
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 36,814 | $ 33,358 | 109,169 | $ 102,113
Other | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | 1,763 |  | 6,233 |
Other | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Services | $ 38,577 |  | $ 115,402 |

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