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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Disaggregation of Revenue [Line Items] |  |
Services | $ 326,968 | $ 344,700
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |
Disaggregation of Revenue [Line Items] |  |
Services | 21,276 |
Calculated under Revenue Guidance in Effect before Topic 606 |  |
Disaggregation of Revenue [Line Items] |  |
Services | 348,244 |
United States |  |
Disaggregation of Revenue [Line Items] |  |
Services | 256,524 | 274,682
United States | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |
Disaggregation of Revenue [Line Items] |  |
Services | 9,018 |
United States | Calculated under Revenue Guidance in Effect before Topic 606 |  |
Disaggregation of Revenue [Line Items] |  |
Services | 265,542 |
Canada |  |
Disaggregation of Revenue [Line Items] |  |
Services | 26,379 | 26,470
Canada | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |
Disaggregation of Revenue [Line Items] |  |
Services | 953 |
Canada | Calculated under Revenue Guidance in Effect before Topic 606 |  |
Disaggregation of Revenue [Line Items] |  |
Services | 27,332 |
Other |  |
Disaggregation of Revenue [Line Items] |  |
Services | 44,065 | 43,548
Other | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |
Disaggregation of Revenue [Line Items] |  |
Services | 11,305 |
Other | Calculated under Revenue Guidance in Effect before Topic 606 |  |
Disaggregation of Revenue [Line Items] |  |
Services | 55,370 |
Food & Beverage |  |
Disaggregation of Revenue [Line Items] |  |
Services | 64,285 | 62,273
Food & Beverage | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |
Disaggregation of Revenue [Line Items] |  |
Services | 6,805 |
Food & Beverage | Calculated under Revenue Guidance in Effect before Topic 606 |  |
Disaggregation of Revenue [Line Items] |  |
Services | 71,090 |
Retail |  |
Disaggregation of Revenue [Line Items] |  |
Services | 35,772 | 43,324
Retail | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |
Disaggregation of Revenue [Line Items] |  |
Services | 840 |
Retail | Calculated under Revenue Guidance in Effect before Topic 606 |  |
Disaggregation of Revenue [Line Items] |  |
Services | 36,612 |
Consumer Products |  |
Disaggregation of Revenue [Line Items] |  |
Services | 31,802 | 37,922
Consumer Products | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |
Disaggregation of Revenue [Line Items] |  |
Services | 132 |
Consumer Products | Calculated under Revenue Guidance in Effect before Topic 606 |  |
Disaggregation of Revenue [Line Items] |  |
Services | 31,934 |
Communications |  |
Disaggregation of Revenue [Line Items] |  |
Services | 29,657 | 35,728
Communications | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |
Disaggregation of Revenue [Line Items] |  |
Services | 3,311 |
Communications | Calculated under Revenue Guidance in Effect before Topic 606 |  |
Disaggregation of Revenue [Line Items] |  |
Services | 32,968 |
Automotive |  |
Disaggregation of Revenue [Line Items] |  |
Services | 20,494 | 32,354
Automotive | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |
Disaggregation of Revenue [Line Items] |  |
Services | 4,218 |
Automotive | Calculated under Revenue Guidance in Effect before Topic 606 |  |
Disaggregation of Revenue [Line Items] |  |
Services | 24,712 |
Technology |  |
Disaggregation of Revenue [Line Items] |  |
Services | 34,144 | 30,550
Technology | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |
Disaggregation of Revenue [Line Items] |  |
Services | 2,835 |
Technology | Calculated under Revenue Guidance in Effect before Topic 606 |  |
Disaggregation of Revenue [Line Items] |  |
Services | 36,979 |
Healthcare |  |
Disaggregation of Revenue [Line Items] |  |
Services | 33,170 | 28,069
Healthcare | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |
Disaggregation of Revenue [Line Items] |  |
Services | 968 |
Healthcare | Calculated under Revenue Guidance in Effect before Topic 606 |  |
Disaggregation of Revenue [Line Items] |  |
Services | 34,138 |
Financials |  |
Disaggregation of Revenue [Line Items] |  |
Services | 21,838 | 19,983
Financials | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |
Disaggregation of Revenue [Line Items] |  |
Services | 285 |
Financials | Calculated under Revenue Guidance in Effect before Topic 606 |  |
Disaggregation of Revenue [Line Items] |  |
Services | 22,123 |
Transportation and Travel/Lodging |  |
Disaggregation of Revenue [Line Items] |  |
Services | 14,848 | 13,213
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 | 697 |
Transportation and Travel/Lodging | Calculated under Revenue Guidance in Effect before Topic 606 |  |
Disaggregation of Revenue [Line Items] |  |
Services | 15,545 |
Other |  |
Disaggregation of Revenue [Line Items] |  |
Services | 40,958 | $ 41,284
Other | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |
Disaggregation of Revenue [Line Items] |  |
Services | 1,185 |
Other | Calculated under Revenue Guidance in Effect before Topic 606 |  |
Disaggregation of Revenue [Line Items] |  |
Services | $ 42,143 |

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