REVENUE - Effect on Statement of comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Revenue
Revenues	$ 275,769	$ 269,554
Operating expenses
Direct costs and expenses for advisors	159,921	156,630
Selling, general and administrative	95,400	91,046
Depreciation and amortization	7,771	12,721
Operating income	12,677	9,157
Interest income	116	107
Interest expense	(6,688)	(6,821)
Foreign currency transaction gain	7	(343)
Income before taxes	6,112	2,100
Income tax provision (benefit)	435	4,198
Net income (loss)	5,677	$ (2,098)
Remaining performance obligations	76,600
ASU 2014-09 | Adjustments
Revenue
Revenues	(4,949)
Operating expenses
Direct costs and expenses for advisors	(502)
Operating income	(4,447)
Income before taxes	(4,447)
Income tax provision (benefit)	(1,067)
Net income (loss)	(3,380)
ASU 2014-09 | As Previously Reported Under ASC 605
Revenue
Revenues	270,820
Operating expenses
Direct costs and expenses for advisors	159,419
Selling, general and administrative	95,400
Depreciation and amortization	7,771
Operating income	8,230
Interest income	116
Interest expense	(6,688)
Foreign currency transaction gain	7
Income before taxes	1,665
Income tax provision (benefit)	(632)
Net income (loss)	$ 2,297