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ACCRUED LIABILITIES
12 Months Ended
Dec. 31, 2012
Payables and Accruals [Abstract]  
ACCRUED LIABILITIES
7.
ACCRUED LIABILITIES
 
Accrued liabilities consist of the following (in thousands):
     
    December 31,  
   
2012
   
2011
 
Compensation and benefits payable
  $ 6,366     $ 4,723  
Telecommunications, sales, use and other taxes
    1,737       1,602  
Customer credit balances
    1,584       1,273  
Other
    1,699       1,554  
    $ 11,386     $ 9,152