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DIVESTITURES (Schedule of liabilities and assets related to un-assigned contracts) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Aug. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Deferred revenue $ 0 $ 11,700 $ 10,200    
Prepaid contract service costs to buyer 0 $ 5,700 $ 5,300    
IPTV divestiture [Member]          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Deferred revenue       $ 5,100 $ 10,000
Customer advances         37,300
Total liabilities associated with the unassigned IPTV contracts $ 11,600       47,300
Deferred contract costs         24,600
Prepaid contract service costs to buyer         22,700
Total assets associated with the un-assigned IPTV contracts         $ 47,300