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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Services | $ 259,678 | $ 362,130 | $ 587,420 | $ 690,921 | $ 1,415,803 | $ 1,475,088 | $ 1,513,779
United States |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Services | 210,342 | 284,659 | 474,903 | 547,676 |  |  |
Canada |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Services | 16,609 | 24,564 | 34,865 | 46,942 |  |  |
Other |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Services | 32,727 | 52,907 | 77,652 | 96,303 |  |  |
Food & Beverage |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Services | 46,811 | 73,305 | 104,396 | 139,969 |  |  |
Retail |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Services | 32,728 | 39,894 | 69,537 | 72,350 |  |  |
Consumer Products |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Services | 34,855 | 45,296 | 74,189 | 78,232 |  |  |
Communications |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Services | 16,172 | 47,793 | 38,014 | 87,490 |  |  |
Automotive |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Services | 13,020 | 18,541 | 38,212 | 36,732 |  |  |
Technology |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Services | 38,846 | 28,876 | 88,341 | 54,279 |  |  |
Healthcare |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Services | 23,112 | 25,954 | 46,843 | 49,161 |  |  |
Financials |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Services | 19,748 | 27,868 | 43,753 | 52,795 |  |  |
Transportation and Travel/Lodging |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Services | 9,053 | 27,050 | 25,552 | 44,085 |  |  |
Other |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Services | $ 25,333 | $ 27,553 | $ 58,583 | $ 75,828 |  |  |

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