Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2012

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
	2012			2011
Computer and networking equipment	$	655,043		$	561,952		3
Purchased software	35,176			31,388			3
Furniture and fixtures	16,917			14,166			5
Office equipment	7,109			5,676			3
Leasehold improvements	44,539			36,358			2-12
Internal-use software	272,441			222,914			2-3
	1,031,225			872,454
Accumulated depreciation and amortization	(686,134		)	(579,411		)
	$	345,091		$	293,043

Schedule of Capitalized Internal-Use Software Costs

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

	December 31,
	2012			2011
Gross costs capitalized	$	294,531		$	230,938
Less: cumulative impairments	(22,090		)	(8,024		)
	272,441			222,914
Less: accumulated amortization, net of impairments	(185,430		)	(152,140		)
Net book value of capitalized internal-use software	$	87,011		$	70,774