Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2011

Property and Equipment [Abstract]

Schedule of Property and Equipment

Property and equipment consisted of the following (dollars in thousands):

	December 31,						Estimated Useful Lives in Years
	2011			2010
Computer and networking equipment	$	561,952		$	492,685		3
Purchased software	31,388			29,885			3
Furniture and fixtures	14,166			12,770			5
Office equipment	5,676			4,792			3
Leasehold improvements	36,358			29,914			2-12
Internal-use software	222,914			177,918			2
	872,454			747,964
Accumulated depreciation and amortization	(579,411		)	(492,035		)
	$	293,043		$	255,929

Schedule of Capitalized Internal-Use Software Costs

The following table summarizes capitalized internal-use software costs (in thousands):

	December 31,
	2011			2010
Gross costs capitalized	$	230,938		$	181,376
Less: cumulative impairments	(8,024		)	(3,458		)
	222,914			177,918
Less: accumulated amortization, net of impairments	(152,140		)	(117,936		)
Net book value of capitalized internal-use software	$	70,774		$	59,982