Concentration Of Credit Risk

12 Months Ended

Dec. 31, 2013

Concentration Of Credit Risk [Abstract]

Concentration of Credit Risk

11.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 all periods reported) and the percentage of total revenue for the specified time periods derived from such customers:

	Percentage of Total Revenues
	for the year ended December 31,
	2013	2012	2011
Sprint (1)	24.9%	23.9%	21.9%
AT&T Wireless	19.0%	20.3%	23.8%
T-Mobile (2)	17.3%	17.2%	13.5%
Verizon Wireless	11.1%	12.7%	14.8%

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:

	Percentage of Site Leasing Revenues
	for the year ended December 31,
	2013	2012	2011
Sprint (1)	28.5%	26.8%	24.6%
AT&T Wireless	21.9%	22.9%	26.8%
T-Mobile (2)	18.7%	18.6%	14.2%
Verizon Wireless	12.1%	13.2%	15.5%
	Percentage of Site Development Revenues
	for the year ended December 31,
	2013	2012	2011
Ericsson, Inc.	34.5%	24.5%	9.0%
Nsoro Mastec, LLC	3.0%	16.2%	35.6%

(1)Prior year amounts have been adjusted to reflect the merger of Sprint and Clearwire.

(2)Prior year amounts have been adjusted to reflect the merger of T-Mobile and Metro PCS.

Five significant customers comprised 51.5% of total gross accounts receivable at December 31, 2013 compared to five significant customers which comprised 55.5% of total gross accounts receivable at December 31, 2012.