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Concentration of Credit Risk | 12 Months Ended
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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: ﻿
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﻿ |  |  |  | For the year ended December 31,
﻿Percentage of Total Revenues |  |  |  | 2018 |  | 2017 |  | 2016
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﻿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:
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﻿ |  |  |  | For the year ended December 31,
﻿Percentage of Domestic Site Leasing Revenue |  |  |  | 2018 |  | 2017 |  | 2016
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﻿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%
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﻿ |  |  |  | For the year ended December 31,
﻿Percentage of International Site Leasing Revenue |  |  |  | 2018 |  | 2017 |  | 2016
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﻿Oi S.A. |  |  |  | 35.5% |  | 42.2% |  | 43.9%
﻿Telefonica |  |  |  | 26.7% |  | 25.7% |  | 26.4%
﻿Claro |  |  |  | 11.4% |  | 10.0% |  | 9.4%
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﻿ |  |  |  | For the year ended December 31,
﻿Percentage of Site Development Revenue |  |  |  | 2018 |  | 2017 |  | 2016
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﻿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.

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- Definition The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -URI http://asc.fasb.org/topic&trid=2134479 + Details
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- References No definition available. + Details
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