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Intangible Assets, Net
 6 Months Ended
Jun. 30, 2018
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, 2018

 

As of December 31, 2017



 

Gross carrying

 

Accumulated

 

Net book

 

Gross carrying

 

Accumulated

 

Net book



 

amount

 

amortization

 

value

 

amount

 

amortization

 

value



 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 



 

(in thousands)

Current contract intangibles

 

$

 4,346,637 

 

$

 (1,783,697)

 

$

 2,562,940 

 

$

 4,355,171 

 

$

 (1,673,270)

 

$

 2,681,901 

Network location intangibles

 

 

 1,646,869 

 

 

 (749,943)

 

 

 896,926 

 

 

 1,617,441 

 

 

 (701,211)

 

 

 916,230 

Intangible assets, net

 

$

 5,993,506 

 

$

 (2,533,640)

 

$

 3,459,866 

 

$

 5,972,612 

 

$

 (2,374,481)

 

$

 3,598,131 



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 $101.3 million and $95.1 million for the three months ended June 30, 2018 and 2017, respectively, and $201.6 million and $190.0 million for the six months ended June 30, 2018 and 2017, respectively.