OPERATING SEGMENTS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenues:
Data center services	$ 41,493	$ 32,481	$ 81,431	$ 64,023
IP services	27,194	27,929	54,284	55,791
Total revenues	68,687	60,410	135,715	119,814
Direct costs of network, sales and services, exclusive of depreciation and amortization:
Data center services	22,649	19,733	43,619	38,263
IP services	9,992	10,836	20,177	21,336
Total direct costs of network, sales and services, exclusive of depreciation and amortization	32,641	30,569	63,796	59,599
Segment profit:
Data center services	18,844	12,748	37,812	25,760
IP services	17,202	17,093	34,107	34,455
Total segment profit	36,046	29,841	71,919	60,215
Restructuring	645	1,304	688	1,492
Other operating expenses, including direct costs of customer support, depreciation and amortization	35,310	30,208	69,432	61,282
Income (loss) from operations	91	(1,671)	1,799	(2,559)
Non-operating expense	2,008	923	3,634	1,609
Loss before income taxes and equity in (earnings) of equity-method investment	$ (1,917)	$ (2,594)	$ (1,835)	$ (4,168)