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Intangible Assets, Net
 6 Months Ended
Jun. 30, 2015
Intangible Assets, Net [Abstract]  
Intangible Assets, Net

6.INTANGIBLE ASSETS, NET

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

As of June 30, 2015

 

As of December 31, 2014

 

 

Gross carrying

 

Accumulated

 

Net book

 

Gross carrying

 

Accumulated

 

Net book

 

 

amount

 

amortization

 

value

 

amount

 

amortization

 

value

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(in thousands)

Current contract intangibles

 

$
4,057,849 

 

$
(1,015,310)

 

$
3,042,539 

 

$
4,090,129 

 

$
(891,374)

 

$
3,198,755 

Network location intangibles

 

 
1,446,246 

 

 
(457,261)

 

 
988,985 

 

 
1,402,704 

 

 
(411,919)

 

 
990,785 

Intangible assets, net

 

$
5,504,095 

 

$
(1,472,571)

 

$
4,031,524 

 

$
5,492,833 

 

$
(1,303,293)

 

$
4,189,540 

 

All intangible assets noted above are included in the Company’s site leasing segments. The Company amortizes its intangible assets using the straight-line method over an estimated economic life of 15 years. Amortization expense relating to the intangible assets was $90.7 million and $89.5 million for the three months ended June 30, 2015 and 2014, respectively, and $182.1 million and $164.3 million for the six months ended June 30, 2015 and 2014, respectively.