Concentration Of Credit Risk (Tables)

12 Months Ended

Dec. 31, 2013

Concentration Of Credit Risk [Abstract]

Summary Of Significant Customers And Percentage Of Total Revenue For Specified Time Periods Derived From Such Customers

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.