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ACCOUNTS RECEIVABLE (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
ACCOUNTS RECEIVABLE    
Accounts receivable $ 48,628 $ 54,767
Less: allowance for doubtful accounts (12,724) (16,462)
Total accounts receivable, net 35,904 38,305
U.S. wireless, Retail    
ACCOUNTS RECEIVABLE    
Accounts receivable 13,659 13,785
U.S. wireless, Wholesale    
ACCOUNTS RECEIVABLE    
Accounts receivable $ 34,969 $ 40,982