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RELATED PARTY TRANSACTIONS (Schedule of Recognized Revenue and Cost of Net Sales for Sales of Telecommunications Equipment and Services to Affiliates of Softbank) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Related party transactions [Line Items]      
Net sales $ 129,420us-gaap_SalesRevenueNet $ 164,439us-gaap_SalesRevenueNet $ 186,728us-gaap_SalesRevenueNet
Gross profit 22,128us-gaap_GrossProfit 40,220us-gaap_GrossProfit 68,158us-gaap_GrossProfit
Softbank and affiliates [Member]      
Related party transactions [Line Items]      
Net sales   90,302us-gaap_SalesRevenueNet
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_MajorityShareholderMember
92,011us-gaap_SalesRevenueNet
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_MajorityShareholderMember
Cost of net sales   59,052us-gaap_CostOfGoodsAndServicesSold
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_MajorityShareholderMember
51,448us-gaap_CostOfGoodsAndServicesSold
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_MajorityShareholderMember
Gross profit   $ 31,250us-gaap_GrossProfit
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_MajorityShareholderMember
$ 40,563us-gaap_GrossProfit
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_MajorityShareholderMember