Concentrations of Credit Risk

3 Months Ended

Mar. 31, 2014

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 AT&T's acquisition of Leap Wireless (completed in March 2014).

	Three Months Ended March 31,
	2014		2013
AT&T	27	%	21	%
Sprint	26	%	28	%
T-Mobile	21	%	23	%
Verizon Wireless	15	%	15	%
Total	89	%	87	%