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DIVESTITURES - Liabilities and Assets Related to Un-Assigned Contracts (Details) - Disposed of by sale, not discontinued operations - IPTV divestiture - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Aug. 31, 2012
DIVESTITURES        
Deferred revenue       $ 10,000
Customer advances       37,300
Total liabilities associated with the un-assigned IPTV contracts $ 10,200     47,300
Deferred contract costs       24,600
Deferred contract service costs to Buyer       22,700
Total assets associated with the un-assigned IPTV contracts 10,200     $ 47,300
Gross profit impact from future revenue recognition of unassigned contracts 0      
Revenues relating to un-assigned contracts 300 $ 3,600 $ 4,300  
Costs relating to unassigned contracts $ 300 $ 3,600 $ 4,300