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Intangible Assets, Net
 6 Months Ended
Jun. 30, 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 June 30, 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

 

$

 4,214,705 

 

$

 (1,533,599)

 

$

 2,681,106 

 

$

 4,141,968 

 

$

 (1,401,025)

 

$

 2,740,943 

Network location intangibles

 

 

 1,537,629 

 

 

 (649,690)

 

 

 887,939 

 

 

 1,515,348 

 

 

 (599,367)

 

 

 915,981 

Intangible assets, net

 

$

 5,752,334 

 

$

 (2,183,289)

 

$

 3,569,045 

 

$

 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 $95.1 million and $92.7 million for the three months ended June 30, 2017 and 2016, respectively, and $190.0 million and $182.8 million for the six months ended June 30, 2017 and 2016, respectively.