Operating Expenses (Schedule Of Direct Operating Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Expenses [Abstract]
Employee compensation expenses	$ 22,855	$ 22,857	$ 20,755
Buildings and facilities expenses	7,179	7,609	7,510
Travel, advertising and promotion expenses	22,150	23,006	22,077
Other direct expenses (net of recoveries)	3,842	4,412	3,666
Cost of Services, Total	$ 56,026	$ 57,884	$ 54,008