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Operating expenses (Schedule of Direct Operating Expenses) (Details) - Service Revenues [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Ancillary and logistical service expenses $ 52,301 $ 59,982 $ 59,252
Employee compensation expenses 50,412 47,745 50,093
Buildings, facilities and technology expenses 10,187 9,886 7,865
Travel, advertising and promotion expenses 18,536 22,636 31,652
Other costs of services 15,426 17,047 16,115
Total direct expenses $ 146,862 $ 157,296 $ 164,977