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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Disaggregation of Revenue [Line Items] |  |
Services | $ 307,585 | $ 327,742
United States |  |
Disaggregation of Revenue [Line Items] |  |
Services | 242,580 | 264,561
Canada |  |
Disaggregation of Revenue [Line Items] |  |
Services | 22,650 | 18,256
Other |  |
Disaggregation of Revenue [Line Items] |  |
Services | 42,355 | 44,925
Food & Beverage |  |
Disaggregation of Revenue [Line Items] |  |
Services | 55,178 | 58,091
Retail |  |
Disaggregation of Revenue [Line Items] |  |
Services | 30,777 | 36,303
Consumer Products |  |
Disaggregation of Revenue [Line Items] |  |
Services | 45,405 | 39,769
Communications |  |
Disaggregation of Revenue [Line Items] |  |
Services | 16,990 | 41,045
Automotive |  |
Disaggregation of Revenue [Line Items] |  |
Services | 15,629 | 25,192
Technology |  |
Disaggregation of Revenue [Line Items] |  |
Services | 46,390 | 25,535
Healthcare |  |
Disaggregation of Revenue [Line Items] |  |
Services | 31,494 | 24,066
Financials |  |
Disaggregation of Revenue [Line Items] |  |
Services | 24,442 | 24,005
Transportation and Travel/Lodging |  |
Disaggregation of Revenue [Line Items] |  |
Services | 9,948 | 20,486
Other |  |
Disaggregation of Revenue [Line Items] |  |
Services | $ 31,332 | $ 33,250

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