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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