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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Services	$ 345,605	$ 259,677	$ 653,190	$ 587,419
United States
Disaggregation of Revenue [Line Items]
Services	277,542	210,342	520,122	474,903
Canada
Disaggregation of Revenue [Line Items]
Services	22,992	16,609	45,642	34,865
Other
Disaggregation of Revenue [Line Items]
Services	45,071	32,726	87,426	77,651
Food & Beverage
Disaggregation of Revenue [Line Items]
Services	62,462	46,811	117,640	104,396
Retail
Disaggregation of Revenue [Line Items]
Services	33,901	32,728	64,678	69,537
Consumer Products
Disaggregation of Revenue [Line Items]
Services	48,784	34,855	94,189	74,189
Communications
Disaggregation of Revenue [Line Items]
Services	19,215	16,172	36,205	38,014
Automotive
Disaggregation of Revenue [Line Items]
Services	13,945	13,020	29,574	38,212
Technology
Disaggregation of Revenue [Line Items]
Services	54,810	38,846	101,200	88,341
Healthcare
Disaggregation of Revenue [Line Items]
Services	37,074	23,112	68,568	46,843
Financials
Disaggregation of Revenue [Line Items]
Services	24,138	19,748	48,580	43,753
Transportation and Travel/Lodging
Disaggregation of Revenue [Line Items]
Services	11,917	9,053	21,865	25,552
Other
Disaggregation of Revenue [Line Items]
Services	$ 39,359	$ 25,332	$ 70,691	$ 58,582

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