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RELATED PARTY TRANSACTIONS (Tables)
12 Months Ended
Dec. 31, 2014
RELATED PARTY TRANSACTIONS [Abstract]  
Schedule of Recognized Revenue and Cost of Net Sales for Sales of Telecommunications Equipment and Services to Affiliates of Softbank
Years Ended December 31,
2013   2012  
    (in thousands)  
Net sales $ 90,302     $ 92,011  
Cost of net sales     59,052       51,448  
Gross profit   $ 31,250     $ 40,563