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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of Revenue [Line Items] |  |
Services | $ 327,742 | $ 328,791
United States |  |
Disaggregation of Revenue [Line Items] |  |
Services | 264,561 | 263,017
Canada |  |
Disaggregation of Revenue [Line Items] |  |
Services | 18,256 | 22,378
Other |  |
Disaggregation of Revenue [Line Items] |  |
Services | 44,925 | 43,396
Food & Beverage |  |
Disaggregation of Revenue [Line Items] |  |
Services | 58,091 | 66,663
Retail |  |
Disaggregation of Revenue [Line Items] |  |
Services | 36,303 | 32,580
Consumer Products |  |
Disaggregation of Revenue [Line Items] |  |
Services | 39,769 | 35,001
Communications |  |
Disaggregation of Revenue [Line Items] |  |
Services | 41,045 | 39,798
Automotive |  |
Disaggregation of Revenue [Line Items] |  |
Services | 25,192 | 18,191
Technology |  |
Disaggregation of Revenue [Line Items] |  |
Services | 25,535 | 26,616
Healthcare |  |
Disaggregation of Revenue [Line Items] |  |
Services | 24,066 | 23,297
Financials |  |
Disaggregation of Revenue [Line Items] |  |
Services | 24,005 | 25,126
Transportation and Travel/Lodging |  |
Disaggregation of Revenue [Line Items] |  |
Services | 20,486 | 17,441
Other |  |
Disaggregation of Revenue [Line Items] |  |
Services | $ 33,250 | $ 44,078

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