FIXED ASSETS

12 Months Ended

Dec. 31, 2020

FIXED ASSETS:

FIXED ASSETS:

7. FIXED ASSETS:

As of December 31, 2020 and 2019, property, plant and equipment consisted of the following (in thousands):

	Useful Life
	(in Years)	2020		2019
Telecommunications equipment and towers	5 -15	$	1,012,457	$	979,028
Solar assets	20-23		-		40,043
Office and computer equipment	3 -10		87,427		82,630
Buildings	15-39		52,048		48,565
Transportation vehicles	3 -10		13,730		13,424
Leasehold improvements	Shorter of useful life or lease term		16,709		2,316
Land	—		8,180		15,503
Furniture and fixtures	5 -10		11,320		8,866
Total property, plant and equipment			1,201,871		1,190,375
Construction in progress			50,909		47,180
Total property, plant and equipment			1,252,780		1,237,555
Less: Accumulated depreciation			(716,318)		(631,974)
Net fixed assets		$	536,462	$	605,581

Depreciation and amortization of fixed assets, using the straight-line method over the assets’ estimated useful life, for the years ended December 31, 2020, 2019 and 2018 was $86.5 million, $86.9 million and $83.0 million, respectively. Included within telecommunication equipment and towers are certain right to use assets under capital lease with a cost of $25.4 million and $25.9 million and net book value of and $15.9 million and $16.5 million, as of December 31, 2020 and 2019, respectively.

For the years ended December 31, 2020 and 2019, the Company received capital expenditure grants of $16.3 million and $3.1 million, respectively.

The Company had $5.6 million and $3.6 million of capitalized implementation costs at December 31, 2020 and 2019, respectively. The Company amortized $0.7 and $0.2 million of implementation costs during the year ended December 31, 2020 and 2019, respectively.