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Intangible Assets, Net
12 Months Ended
Dec. 31, 2019
Intangible Assets, Net [Abstract]  
Intangible Assets, Net 9.INTANGIBLE ASSETS, NET

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

As of December 31, 2019

As of December 31, 2018

Gross carrying

Accumulated

Net book

Gross carrying

Accumulated

Net book

amount

amortization

value

amount

amortization

value

(in thousands)

Current contract intangibles

$

4,996,591

$

(2,218,404)

$

2,778,187

$

4,394,416

$

(1,928,030)

$

2,466,386

Network location intangibles

1,764,484

(915,898)

848,586

1,669,859

(804,780)

865,079

Intangible assets, net

$

6,761,075

$

(3,134,302)

$

3,626,773

$

6,064,275

$

(2,732,810)

$

3,331,465

All intangible assets noted above are included in the Company’s site leasing segment. Amortization expense relating to the intangible assets above was $415.2 million, $402.6 million, and $384.1 million for the years ended December 31, 2019, 2018 and 2017, respectively.

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

For the year ended December 31,

(in thousands)

2020

$

450,547

2021

417,906

2022

396,139

2023

372,294

2024

343,481