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Operating expenses | 9 Months Ended
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Sep. 30, 2021
Operating expenses |
Operating expenses | 8. Operating expenses Costs of services ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Nine months ended | ​
​ | ​ | September 30, | ​ | September 30, | ​
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020 | ​
Ancillary and logistical service expenses | ​ | $ | 11,433 |  | $ | 16,550 | ​ | $ | 38,521 |  | $ | 45,368 | ​
Employee compensation expenses | ​ | ​ | 12,182 | ​ |  | 11,442 | ​ | ​ | 37,567 | ​ |  | 35,057 | ​
Buildings, facilities and technology expenses | ​ | ​ | 2,496 | ​ |  | 1,653 | ​ | ​ | 7,501 | ​ |  | 7,768 | ​
Travel, advertising and promotion expenses | ​ | ​ | 3,205 | ​ |  | 4,782 | ​ | ​ | 13,022 | ​ |  | 17,518 | ​
Other costs of services | ​ | ​ | 3,722 | ​ |  | 4,796 | ​ | ​ | 11,496 | ​ |  | 12,315 | ​
​ | ​ | $ | 33,038 | ​ | $ | 39,223 | ​ | $ | 108,107 | ​ | $ | 118,026 | ​
​ SG&A expenses ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Nine months ended | ​
​ | ​ | September 30, |  | September 30, | ​
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020 | ​
Wages, salaries and benefits | ​ | $ | 66,880 | ​ | $ | 69,862 | ​ | $ | 215,867 | ​ | $ | 194,403 | ​
Share-based compensation expense | ​ | ​ | 5,627 | ​ | ​ | 8,568 | ​ | ​ | 16,945 | ​ | ​ | 17,329 | ​
Buildings, facilities and technology expenses | ​ |  | 18,213 |  | ​ | 15,901 | ​ |  | 53,035 | ​ |  | 46,108 | ​
Travel, advertising and promotion expenses | ​ |  | 6,541 |  | ​ | 5,479 | ​ |  | 18,527 | ​ |  | 20,565 | ​
Professional fees | ​ |  | 6,323 |  | ​ | 4,546 | ​ |  | 16,557 | ​ |  | 13,570 | ​
Other SG&A expenses | ​ |  | 4,994 |  | ​ | 5,830 | ​ |  | 15,544 | ​ |  | 17,228 | ​
​ | ​ | $ | 108,578 |  | $ | 110,186 | ​ | $ | 336,475 | ​ | $ | 309,203 | ​
​ ​ 8. Operating expenses (continued) ​ Depreciation and amortization expenses ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Nine months ended | ​
​ | ​ | September 30, |  | September 30, | ​
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020 | ​
Depreciation expense | ​ | $ | 8,127 | ​ | $ | 7,705 | ​ | $ | 24,309 | ​ | $ | 23,278 | ​
Amortization expense | ​ |  | 13,780 | ​ |  | 10,731 | ​ |  | 40,603 | ​ |  | 32,308 | ​
​ | ​ | $ | 21,907 | ​ | $ | 18,436 | ​ | $ | 64,912 | ​ | $ | 55,586 | ​
​

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