Annual report pursuant to Section 13 and 15(d)

FAIR VALUE MEASUREMENTS - Summary of Goodwill for Wireline Segment (Details)

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FAIR VALUE MEASUREMENTS - Summary of Goodwill for Wireline Segment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Goodwill [Roll Forward]      
Goodwill $ 0    
Goodwill addition during the year 23,600 $ 0 $ 0
Less impairment losses 0 0  
Goodwill 23,624 0  
Wireline Operating Segment      
Goodwill [Roll Forward]      
Goodwill 0 0  
Goodwill addition during the year 23,624 0  
Less impairment losses 0 0  
Goodwill $ 23,624 $ 0 $ 0