SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 9)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues | Customer concentration | AT&T
Credit concentrations and significant customers
Percentage of concentration risk	18.00%	20.00%	20.00%
Revenues | Customer concentration | Verizon
Credit concentrations and significant customers
Percentage of concentration risk	13.00%	11.00%	10.00%
Accounts receivable | Credit concentration | AT&T
Credit concentrations and significant customers
Percentage of concentration risk	29.00%	31.00%
Accounts receivable | Credit concentration | Verizon
Credit concentrations and significant customers
Percentage of concentration risk	10.00%	9.00%