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Operating expenses (Schedule of Direct Operating Expenses) (Details) - Service Revenue [Member] - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 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
Total direct expenses | $ 33,038 | $ 39,223 | $ 108,107 | $ 118,026

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