Concentration Of Credit Risk (Tables)

12 Months Ended

Dec. 31, 2014

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 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	2014	2013	2012
Sprint (1)	23.4%	25.0%	23.9%
AT&T Wireless (2)	23.0%	20.5%	21.9%
T-Mobile (3)	15.5%	17.3%	17.2%
Verizon Wireless	12.0%	11.3%	13.0%

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	2014	2013	2012
AT&T Wireless (2)	30.1%	25.5%	26.1%
Sprint (1)	25.6%	30.9%	28.5%
T-Mobile (3)	19.2%	20.2%	19.7%
Verizon Wireless	14.4%	13.3%	14.3%
	For the year ended December 31,
Percentage of International Site Leasing Revenue	2014	2013	2012
Oi S.A.	44.3%	6.3%	0.1%
Telefonica	28.8%	44.2%	48.1%
Claro	8.0%	8.8%	12.6%
Digicel	4.9%	11.2%	19.5%

	For the year ended December 31,
Percentage of Site Development Revenue	2014	2013	2012
Sprint (1)	36.7%	1.5%	1.1%
Ericsson, Inc.	16.8%	34.5%	24.5%
Verizon Wireless	10.1%	4.8%	8.9%
MasTec Inc.	1.9%	4.6%	16.4%

(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 AT&T Wireless and Leap Wireless (Cricket Wireless).

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