Operating Expenses (Schedule of Direct Operating Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Operating Expenses [Abstract]
Employee compensation expenses	$ 8,813	$ 8,880	$ 14,289	$ 15,138
Buildings, facilities and technology expenses	2,401	2,011	3,947	4,306
Travel, advertising and promotion expenses	7,426	7,359	12,082	13,296
Other costs of services	2,951	1,508	4,086	2,331
Cost of Services, Total	$ 21,591	$ 19,758	$ 34,404	$ 35,071