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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 9) | 12 Months Ended
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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% |

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