Concentration of Credit Risk

9 Months Ended

Sep. 30, 2013

Risks And Uncertainties [Abstract]

Concentration of Credit Risk

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

	For the three months						For the nine months
Site Leasing Revenue	ended September 30,						ended September 30,
	2013			2012			2013			2012
Sprint (1)		28.2	%		24.2	%		28.5	%		24.9	%
AT&T		22.7	%		23.0	%		22.3	%		23.8	%
T-Mobile(2)		16.5	%		18.0	%		16.7	%		16.6	%
Verizon		12.3	%		13.3	%		12.2	%		13.7	%

	For the three months						For the nine months
Site Development Revenue	ended September 30,						ended September 30,
	2013			2012			2013			2012
Ericsson, Inc.		32.2	%		23.6	%		38.1	%		19.7	%
T-Mobile(2)		10.5	%		2.5	%		7.9	%		8.3	%
Alcatel-Lucent		8.1	%		8.3	%		10.1	%		6.1	%
Nsoro		2.1	%		17.3	%		3.1	%		19.9	%

(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.

At September 30, 2013, five significant customers comprised 53.9% of total gross accounts receivable compared to five significant customers which comprised 55.5% of total gross accounts receivable at December 31, 2012.