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Intangible Assets, Net
 3 Months Ended
Mar. 31, 2017
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 March 31, 2017

 

As of December 31, 2016



 

Gross carrying

 

Accumulated

 

Net book

 

Gross carrying

 

Accumulated

 

Net book



 

amount

 

amortization

 

value

 

amount

 

amortization

 

value



 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 



 

(in thousands)

Current contract intangibles

 

$

 4,179,583 

 

$

 (1,473,948)

 

$

 2,705,635 

 

$

 4,141,968 

 

$

 (1,401,025)

 

$

 2,740,943 

Network location intangibles

 

 

 1,525,534 

 

 

 (625,621)

 

 

 899,913 

 

 

 1,515,348 

 

 

 (599,367)

 

 

 915,981 

Intangible assets, net

 

$

 5,705,117 

 

$

 (2,099,569)

 

$

 3,605,548 

 

$

 5,657,316 

 

$

 (2,000,392)

 

$

 3,656,924 



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 $94.9 million and $90.2 million for the three months ended March 31, 2017 and 2016,  respectively.