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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 ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Related Party Transaction [Line Items]      
Total net sales $ 117,103,000 $ 129,420,000 $ 164,439,000
Cost of net sales 89,235,000 107,292,000 124,219,000
Gross profit $ 27,868,000 $ 22,128,000 40,220,000
Softbank and affiliates [Member]      
Related Party Transaction [Line Items]      
Total net sales     90,302,000
Cost of net sales     59,052,000
Gross profit     $ 31,250,000