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Operating expenses | 12 Months Ended
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Dec. 31, 2020
Operating expenses |
Operating expenses | 7. Operating expenses Costs of services ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year ended December 31, | ​ | 2020 |  | 2019 |  | 2018
Ancillary and logistical service expenses | ​ | $ | 59,982 | ​ | $ | 59,252 | ​ | $ | 66,576
Employee compensation expenses | ​ |  | 47,745 | ​ |  | 50,093 | ​ |  | 41,391
Buildings, facilities and technology expenses | ​ |  | 9,886 | ​ |  | 7,865 | ​ |  | 9,477
Travel, advertising and promotion expenses | ​ |  | 22,636 | ​ |  | 31,652 | ​ |  | 27,606
Other costs of services | ​ |  | 17,047 | ​ |  | 16,115 | ​ |  | 14,008
​ | ​ | $ | 157,296 | ​ | $ | 164,977 | ​ | $ | 159,058
​ SG&A expenses ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year ended December 31, | ​ | 2020 |  | 2019 |  | 2018
Employee compensation expenses | ​ | $ | 286,908 | ​ | $ | 246,028 | ​ | $ | 249,115
Buildings, facilities and technology expenses | ​ |  | 62,755 | ​ |  | 61,177 | ​ |  | 60,930
Travel, advertising and promotion expenses | ​ |  | 25,780 | ​ |  | 38,248 | ​ |  | 36,728
Professional fees | ​ |  | 18,220 | ​ |  | 15,572 | ​ |  | 16,768
Other SG&A expenses | ​ |  | 23,860 | ​ |  | 21,364 | ​ |  | 19,135
​ | ​ | $ | 417,523 | ​ | $ | 382,389 | ​ | $ | 382,676
​ Acquisition-related costs ​ Acquisition-related costs consist of operating expenses directly incurred as part of our business combinations such as due diligence and integration planning related to our acquisitions, and share-based continuing employment costs. The following is a summary of our acquisition-related costs: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year ended December 31, | ​ | 2020 |  | 2019 |  | 2018
Rouse: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Share-based continuing employment costs | ​ | $ | 802 | ​ | $ | — | ​ | $ | —
Other acquisition-related costs | ​ | ​ | 5,212 | ​ | ​ | — | ​ | ​ | —
​ | ​ | ​ | 6,014 | ​ | ​ | — | ​ | ​ | —
IronPlanet: | ​ | ​ |  |  | ​ |  |  | ​ |
Other acquisition-related costs | ​ | ​ | — | ​ | ​ | 82 | ​ | ​ | 2,944
Other acquisitions: | ​ |  |  | ​ |  |  | ​ |  |
Continuing employment costs | ​ |  | — | ​ |  | 128 | ​ |  | 2,091
Other acquisition-related costs | ​ |  | — | ​ |  | 567 | ​ |  | 58
​ | ​ | ​ | — | ​ | ​ | 777 | ​ | ​ | 5,093
​ | ​ | $ | 6,014 | ​ | $ | 777 | ​ | $ | 5,093
​ 7. Operating expenses (continued) ​ Depreciation and amortization expenses ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year ended December 31, | ​ | 2020 |  | 2019 |  | 2018
Depreciation expense | ​ | $ | 31,330 | ​ | $ | 29,112 | ​ | $ | 29,021
Amortization expense | ​ |  | 43,591 | ​ |  | 41,389 | ​ |  | 37,593
​ | ​ | $ | 74,921 | ​ | $ | 70,501 | ​ | $ | 66,614
​ During the year ended December 31, 2020, depreciation expense of $199,000 (2019: $410,000; 2018: $494,000) and amortization expense of $29,779,000 (2019: $27,944,000; 2018: $18,996,000) were recorded relating to software.

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