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Intangible Assets, Net
 3 Months Ended
Mar. 31, 2021
Intangible Assets, Net [Abstract]  
Intangible Assets, Net 8.INTANGIBLE ASSETS, NET

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

As of March 31, 2021

As of December 31, 2020

Gross carrying

Accumulated

Net book

Gross carrying

Accumulated

Net book

amount

amortization

value

amount

amortization

value

(in thousands)

Current contract intangibles

$

4,794,137

$

(2,520,675)

$

2,273,462

$

4,876,880

$

(2,471,438)

$

2,405,442

Network location intangibles

1,754,579

(1,043,943)

710,636

1,770,944

(1,020,236)

750,708

Intangible assets, net

$

6,548,716

$

(3,564,618)

$

2,984,098

$

6,647,824

$

(3,491,674)

$

3,156,150

All intangible assets noted above are included in the Company’s site leasing segment. Amortization expense relating to the intangible assets above was $109.8 million and $110.7 million for the three months ended March 31, 2021 and 2020, respectively.