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INTANGIBLE ASSETS AND GOODWILL - Schedule of Components of Goodwill (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Goodwill [Line Items]      
Goodwill, gross $ 584,298 $ 584,298  
Accumulated impairment losses (283,406) (283,406)  
Goodwill 300,892 300,892 $ 416,892
Cloud and Edge      
Goodwill [Line Items]      
Goodwill, gross 392,302 392,302  
Accumulated impairment losses (167,406) (167,406)  
Goodwill 224,896 224,896 224,896
IP Optical Networks      
Goodwill [Line Items]      
Goodwill, gross 191,996 191,996  
Accumulated impairment losses (116,000) (116,000)  
Goodwill $ 75,996 $ 75,996 $ 191,996