PROPERTY AND EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2012

Property, Plant and Equipment [Abstract]

Schedule of property and equipment

	December 31,
	2012			2011
Network equipment	$	129,168		$	121,477
Network equipment under capital lease		6,386			5,662
Furniture and equipment		17,955			11,387
Software		45,011			38,417
Leasehold improvements		279,219			231,701
Buildings under capital lease		43,325			36,030
Property and equipment, gross		521,064			444,674
Less: accumulated depreciation and amortization ($11,351 and $6,353 related to capital leases at December 31, 2012 and 2011, respectively)		(272,969	)		(246,305	)
	$	248,095		$	198,369

Schedule of estimated useful lives of assets

	Estimated Useful Life (in years)
	Original		Revised
Network equipment		3		5
C Capitalized software		3		5
Leasehold improvements		7		10-25

Schedule of summary of depreciation and amortization of property and equipment associated with direct costs

	Year ended December 31,
	2012		2011		2010
Direct costs of network, sales and services	$	33,019	$	36,040	$	26,930
Other depreciation and amortization		3,128		886		3,228
Subtotal		36,147		36,926		30,158
Amortization of acquired technologies		4,718		3,500		3,811
Total depreciation and amortization	$	40,865	$	40,426	$	33,969