Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill and Finite-Lived Intangible Assets [Line Items]

Schedule of Goodwill

Goodwill

The change in the carrying value of goodwill for the year ended December 31, 2018 is as follows:

Balance as of December 31, 2017	$	10,021
Adjustments due to other acquisitions, purchase price allocations and other, net	57
Balance as of December 31, 2018	$	10,078

Intangible Assets

Intangibles

The following is a summary of the Company's intangible assets. See note 4 for further discussion of the Company's acquisitions.

	As of December 31, 2019							As of December 31, 2018
	Gross Carrying Value		Accumulated Amortization			Net Book Value		Gross Carrying Value		Accumulated Amortization			Net Book Value
Site rental contracts and tenant relationships	$	7,761	$	(2,997	)	$	4,764	$	7,787	$	(2,578	)	$	5,209
Other intangible assets(a)	143		(71		)	72		494		(187		)	307
Total	$	7,904	$	(3,068	)	$	4,836	$	8,281	$	(2,765	)	$	5,516

(a)

See "Recently Adopted Accounting Pronouncements" in note 3 for a discussion of the recently adopted new lease standard, including with respect to below-market leases previously classified as intangible assets.

Schedule of Amortization Expense

Amortization expense related to intangible assets is classified as follows on the Company's consolidated statement of operations and comprehensive income (loss):

	For Years Ended December 31,
Classification	2019		2018		2017
Depreciation, amortization and accretion	$	428	$	428	$	314
Site rental costs of operations(a)	—		17		18
Total amortization expense	$	428	$	445	$	332

(a)

Amortization expense of intangible assets classified as "Site rental costs of operations" on the Company's consolidated statement of operations and comprehensive income (loss) for the years ended December 31, 2018 and 2017 represented amortization of below-market leases. Effective January 1, 2019, these below-market leases were de-recognized and reclassified from "Other intangible assets, net" to the "Operating lease right-of-use assets" on the Company's consolidated balance sheet. See "Recently Adopted Accounting Pronouncements" in note 3 for a discussion of the recently adopted new lease standard.

Site Rental Contracts and Customer Relationships [Member]

Goodwill and Finite-Lived Intangible Assets [Line Items]

Schedule of Estimated Annual Amortization Expense

The estimated annual amortization expense related to intangible assets for the years ending December 31, 2020 to 2024 is as follows:

	Years Ending December 31,
	2020		2021		2022		2023		2024
Estimated annual amortization	$	427	$	427	$	427	$	427	$	384