CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Revenue from Contract with Customer, Excluding Assessed Tax	$ 71,026	$ 68,038	$ 139,903	$ 134,593
Operating expenses
Direct costs and expenses for advisors	40,153	40,253	83,137	80,939
Selling, general and administrative	24,680	23,380	46,908	45,105
Depreciation and amortization	1,993	3,859	3,895	6,822
Operating income	4,200	546	5,963	1,727
Interest income	3	34	110	79
Interest expense	(1,728)	(1,707)	(3,465)	(3,416)
Foreign currency transaction gain (loss)	49	(101)	25	(181)
Income (loss) before taxes	2,524	(1,228)	2,633	(1,791)
Income tax provision (benefit)	162	(923)	107	(915)
Net income (loss)	2,362	(305)	2,526	(876)
Net (loss) income attributable to non-controlling interest		(3)		32
Net income (loss) attributable to ISG	$ 2,362	$ (302)	$ 2,526	$ (908)
Weighted average shares outstanding:
Basic (in shares)	44,655	43,058	44,180	42,687
Diluted (in shares)	46,086	43,058	45,973	42,687
Earnings (loss) per share attributable to ISG:
Basic (in dollars per share)	$ 0.05	$ (0.01)	$ 0.06	$ (0.02)
Diluted (in dollars per share)	$ 0.05	$ (0.01)	$ 0.05	$ (0.02)
Comprehensive income:
Net income (loss)	$ 2,362	$ (305)	$ 2,526	$ (876)
Foreign currency translation, net of tax benefit (expense) of $465, $(563), $311 and $(929), respectively.	(1,496)	678	(1,004)	1,349
Comprehensive income	866	373	1,522	473
Comprehensive (loss) income attributable to non-controlling interest		(3)		32
Comprehensive income attributable to ISG	$ 866	$ 376	$ 1,522	$ 441