REPORTABLE SEGMENTS AND RELATED INFORMATION - Summary of Financial Information for Reportable and Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenues	$ 83,472	$ 84,533	$ 85,326	$ 83,177	$ 78,342	$ 80,373	$ 80,810	$ 78,390	$ 336,508	$ 317,915	$ 292,376
Costs & expenses									251,242	233,308	216,696
Depreciation & amortization	1,818	1,810	1,688	1,613	1,675	1,674	1,736	1,664	6,929	6,749	8,385
Operating income (loss) before income taxes	$ 17,423	$ 20,086	$ 19,719	$ 21,109	$ 16,773	$ 20,388	$ 20,341	$ 20,356	78,337	77,858	67,295
Operating Segments | Outsourced Portals
Segment Reporting Information [Line Items]
Revenues									311,351	296,998	273,502
Costs & expenses									191,572	180,287	168,166
Depreciation & amortization									2,698	3,230	4,649
Operating income (loss) before income taxes									117,081	113,481	100,687
Operating Segments | Other Software & Services
Segment Reporting Information [Line Items]
Revenues									25,157	20,917	18,874
Costs & expenses									8,890	5,958	5,432
Depreciation & amortization									97	77	47
Operating income (loss) before income taxes									16,170	14,882	13,395
Other Reconciling Items
Segment Reporting Information [Line Items]
Revenues									0	0	0
Costs & expenses									50,780	47,063	43,098
Depreciation & amortization									4,134	3,442	3,689
Operating income (loss) before income taxes									$ (54,914)	$ (50,505)	$ (46,787)