Concentrations of Credit Risk Concentrations of Credit Risk

6 Months Ended

Jun. 30, 2013

Concentrations of Credit Risk [Abstract]

Concentration Risk Disclosure [Text Block]

Concentration of Credit Risk

The Company derives the largest portion of its revenues from customers in the wireless communications industry. The Company also has a concentration in its volume of business with Sprint, AT&T, Verizon Wireless and T-Mobile or their agents that accounts for a significant portion of the Company's revenues, receivables and deferred site rental receivables. The Company mitigates its concentrations of credit risk with respect to trade receivables by actively monitoring the creditworthiness of its customers, utilizing customer leases with contractually determinable payment terms and proactively managing past due balances.

Major Customers

The following table summarizes the percentage of the consolidated revenues for those customers accounting for more than 10% of the consolidated revenues (all of such customer revenues relate to our CCUSA segment). The following table is after giving effect to the T-Mobile's acquisition of MetroPCS (completed in April 2013), and Sprint's acquisition of Clearwire (completed in July 2013).

	Six Months Ended June 30,
	2013		2012
Sprint	30	%	23	%
T-Mobile	21	%	10	%
AT&T	17	%	21	%
Verizon Wireless	16	%	18	%
Total	84	%	72	%