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Concentration of Credit Risk
 12 Months Ended
Dec. 31, 2018
Concentration of Credit Risk [Abstract]  
Concentration of Credit Risk

10.CONCENTRATION OF CREDIT RISK

The Company’s credit risks consist primarily of accounts receivable with national, regional, and local wireless service providers and federal and state government agencies. The Company performs periodic credit evaluations of its customers’ financial condition and provides allowances for doubtful accounts, as required, based upon factors surrounding the credit risk of specific customers, historical trends, and other information. The Company generally does not require collateral.

The following is a list of significant customers (representing at least 10% of revenue for any period reported) and the percentage of total revenue for the specified time periods derived from such customers:





 

 

 

 

 

 

 

 



 

 

 

 

 

 

 

 



 

 

 

For the year ended December 31,

Percentage of Total Revenues

 

 

 

2018

 

2017

 

2016



 

 

 

 

 

 

 

 

AT&T Wireless

 

 

 

 24.0% 

 

 25.0% 

 

 25.7% 

Sprint

 

 

 

 17.9% 

 

 15.1% 

 

 16.1% 

T-Mobile

 

 

 

 16.4% 

 

 16.5% 

 

 17.0% 

Verizon Wireless

 

 

 

 14.7% 

 

 15.2% 

 

 15.2% 



The Company’s site leasing and site development segments derive revenue from these customers. Client percentages of total revenue in each of the segments are as follows:



 

 

 

 

 

 

 

 



 

 

 

 

 

 

 

 



 

 

 

For the year ended December 31,

Percentage of Domestic Site Leasing Revenue

 

 

 

2018

 

2017

 

2016



 

 

 

 

 

 

 

 

AT&T Wireless

 

 

 

 31.9% 

 

 32.7% 

 

 32.7% 

T-Mobile

 

 

 

 20.3% 

 

 19.7% 

 

 19.6% 

Sprint

 

 

 

 19.6% 

 

 18.9% 

 

 19.8% 

Verizon Wireless

 

 

 

 19.0% 

 

 19.0% 

 

 18.2% 



 

 

 

 

 

 

 

 



 

 

 

For the year ended December 31,

Percentage of International Site Leasing Revenue

 

 

 

2018

 

2017

 

2016



 

 

 

 

 

 

 

 

Oi S.A.

 

 

 

 35.5% 

 

 42.2% 

 

 43.9% 

Telefonica

 

 

 

 26.7% 

 

 25.7% 

 

 26.4% 

Claro

 

 

 

 11.4% 

 

 10.0% 

 

 9.4% 







 

 

 

 

 

 

 

 



 

 

 

 

 

 

 

 



 

 

 

For the year ended December 31,

Percentage of Site Development Revenue

 

 

 

2018

 

2017

 

2016



 

 

 

 

 

 

 

 

Sprint

 

 

 

 47.1% 

 

 12.9% 

 

 11.7% 

T-Mobile

 

 

 

 16.4% 

 

 26.9% 

 

 28.4% 

Verizon Wireless

 

 

 

 6.4% 

 

 12.8% 

 

 16.5% 

Nokia, Inc.

 

 

 

 3.2% 

 

 10.1% 

 

 7.1% 

Five customers comprised 67.5% of total gross accounts receivable at December 31, 2018 compared to five customers which comprised 66.9% of total gross accounts receivable at December 31, 2017.