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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 Millions
Dec. 31, 2017
Dec. 31, 2016
DIVESTITURES    
Deferred costs related to un-assigned contracts $ 5.9 $ 10.2
Liabilities associated with the un-assigned contracts $ 5.9 $ 10.2