Leases (Tables)

12 Months Ended

Dec. 31, 2019

Dec. 31, 2018

Leases [Abstract]

Lessee, Operating Lease, Liability, Maturity [Table Text Block]

The following table is a summary of the Company's maturities of operating lease liabilities as of December 31, 2019:

	Years Ending December 31,
	2020		2021		2022		2023		2024		Thereafter		Total undiscounted lease payments		Less: Imputed interest			Total operating lease liabilities
Operating leases(a)	$	534	$	528	$	524	$	520	$	517	$	6,357	$	8,980	$	(3,170	)	$	5,810

(a)

Excludes the Company's contingent payments for operating leases (such as payments based on revenues derived from the communications infrastructure located on the leased asset) as such arrangements are excluded from the Company's operating lease liability. Such contingencies are recognized as expense in the period they are resolved.

The operating lease payments included in the table below include payments for certain renewal periods exercisable at the Company's option that are deemed reasonably assured to be exercised and an estimate of contingent payments based on revenues and gross margins derived from existing tenant leases. 

	Years Ending December 31,
	2019		2020		2021		2022		2023		Thereafter		Total
Operating leases	$	640	$	631	$	628	$	623	$	619	$	8,054	$	11,195

Lease, Cost [Table Text Block]

The components of the Company's operating lease expense are as follows:

	Year Ended December 31,
	2019
Lease cost:
Operating lease expense(a)	$	648
Variable lease expense(b)	133
Total lease expense(c)	$	781

(a) Represents the Company's operating lease expense related to its ROU assets for the twelve months ended December 31, 2019.

(b) Represents the Company's expense related to contingent payments for operating leases (such as payments based on revenues derived from the communications infrastructure located on the leased asset) for the twelve months ended December 31, 2019. Such contingencies are recognized as expense in the period they are resolved.

(c)

Excludes those direct operating expenses accounted for pursuant to accounting guidance outside the scope of ASC 842.