Operating Expenses (Schedule of Direct Operating Expenses) (Details) - Service Revenues [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Employee compensation expenses	$ 66,081	$ 58,808	$ 54,977
Ancillary and logistical service expenses	52,628	52,301	59,982
Travel, advertising and promotion expenses	22,604	18,536	22,636
Other costs of services	14,718	15,426	17,047
Buildings, facilities and technology expenses	12,096	10,187	9,886
Total direct expenses	$ 168,127	$ 155,258	$ 164,528