Segment Information (Schedule Of Segment Revenues Before Reimbursements, Segment Total Revenues And Segment Operating Profit) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Total revenues before reimbursements	$ 236,211	$ 223,475
Total revenues	257,837	245,287
Total segment operating profit	74,445	72,698
General and administrative expenses	41,484	39,831
Depreciation expense	7,473	6,522
Amortization expense	2,319	2,921
Other operating costs, net	1,306
Long-term compensation expense attributable to client-service employees (including share-based compensation expense)	3,286	3,163
Operating income	18,577	20,261
Interest and other expense, net	821	881
Income before income tax expense	17,756	19,380
Healthcare [Member]
Segment Reporting Information [Line Items]
Total revenues before reimbursements	90,546	81,667
Total revenues	98,689	90,102
Total segment operating profit	27,613	23,768
Energy [Member]
Segment Reporting Information [Line Items]
Total revenues before reimbursements	32,498	26,896
Total revenues	37,722	31,279
Total segment operating profit	8,879	6,714
Financial Services Advisory and Compliance [Member]
Segment Reporting Information [Line Items]
Total revenues before reimbursements	32,907	33,650
Total revenues	36,855	36,907
Total segment operating profit	11,614	13,506
Disputes, Forensics & Legal Technology [Member]
Segment Reporting Information [Line Items]
Total revenues before reimbursements	80,260	81,262
Total revenues	84,571	86,999
Total segment operating profit	$ 26,339	$ 28,710