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Intangible Assets, Net
 12 Months Ended
Dec. 31, 2013
Intangible Assets, Net [Abstract]  
Intangible Assets, Net

8.INTANGIBLE ASSETS, NET

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

As of December 31, 2013

 

As of December 31, 2012

 

 

Gross carrying

 

Accumulated

 

Net book

 

Gross carrying

 

Accumulated

 

Net book

 

 

amount

 

amortization

 

value

 

amount

 

amortization

 

value

 

 

(in thousands)

Current contract intangibles

 

$
3,154,616 

 

$
(649,861)

 

$
2,504,755 

 

$
2,744,968 

 

$
(462,016)

 

$
2,282,952 

Network location intangibles

 

 
1,209,142 

 

 
(326,699)

 

 
882,443 

 

 
1,101,566 

 

 
(250,385)

 

 
851,181 

Intangible assets, net

 

$
4,363,758 

 

$
(976,560)

 

$
3,387,198 

 

$
3,846,534 

 

$
(712,401)

 

$
3,134,133 

 

All intangible assets noted above are included in the Company’s site leasing segment. The Company amortizes its intangible assets using the straight-line method over 15 years. Amortization expense relating to the intangible assets above was $266.6 million, $188.7 million, and $133.1 million for the years ended December 31, 2013,  2012 and 2011, respectively.

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

For the year ended December 31,

 

 

 

 

 

 

 

(in thousands)

 

 

 

 

 

 

 

 

 

 

2014

 

 

 

 

 

 

 

$
290,716 

2015

 

 

 

 

 

 

 

 
290,716 

2016

 

 

 

 

 

 

 

 
290,716 

2017

 

 

 

 

 

 

 

 
290,716 

2018

 

 

 

 

 

 

 

 
290,716 

Thereafter

 

 

 

 

 

 

 

 
1,933,618 

Total

 

 

 

 

 

 

 

$
3,387,198