Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Revenue	$ 120,191	$ 124,647	$ 370,934	$ 361,724
Operating expenses:
Cost of revenue (exclusive of depreciation and amortization included below)	80,608	83,088	253,559	249,223
Sales and marketing	9,685	8,725	29,369	26,997
General and administrative	19,868	20,574	60,587	59,243
Research and development	1,698	1,653	5,194	5,128
Depreciation and amortization	2,033	1,866	5,771	5,513
Amortization of acquisition-related intangible assets	842	828	2,453	2,484
Restructuring, impairment and other charges	611	1,363	1,827	3,384
Total operating expenses	115,345	118,097	358,760	351,972
Income from operations	4,846	6,550	12,174	9,752
Interest expense:
Interest on outstanding debt	164	213	413	660
Amortization of deferred financing charges	25	25	79	75
Interest income	9	41	59	80
Other expense (income), net	(42)	66	(153)	950
Income before income taxes	4,708	6,287	11,894	8,147
Provision for income taxes	1,066	1,273	2,580	2,636
Net income	$ 3,642	$ 5,014	$ 9,314	$ 5,511
Net income per share of common stock:
Basic (usd per share)	$ 0.06	$ 0.08	$ 0.15	$ 0.09
Diluted (usd per share)	$ 0.06	$ 0.08	$ 0.15	$ 0.09
Weighted average number of common shares outstanding:
Basic	60,012	59,523	60,263	60,461
Diluted	62,646	61,451	63,070	62,006