Intangible Assets, Net (Tables)

12 Months Ended

Dec. 31, 2012

Gross and Net Carrying Amounts for Each Major Class of Intangible Assets

The following table provides the gross and net carrying amounts for each major class of intangible assets:

	As of December 31, 2012							As of December 31, 2011
	Gross carrying		Accumulated			Net book		Gross carrying		Accumulated			Net book
	amount		amortization			value		amount		amortization			value
	(in thousands)
Current contract intangibles	$	2,744,968	$	(462,016	)	$	2,282,952	$	1,391,001	$	(333,522	)	$	1,057,479
Network location intangibles		1,101,566		(250,385	)		851,181		772,467		(190,162	)		582,305
Intangible assets	$	3,846,534	$	(712,401	)	$	3,134,133	$	2,163,468	$	(523,684	)	$	1,639,784

Estimated Amortization of Intangible Assets

Estimated amortization expense on the Company’s intangibles assets is as follows:

For the year ended December 31,	(in thousands)
2013	$	256,436
2014		256,436
2015		256,436
2016		256,436
2017		256,436
Thereafter		1,851,953
Total	$	3,134,133