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ACCOUNTS RECEIVABLE (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
ACCOUNTS RECEIVABLE    
Accounts receivable $ 48,314 $ 64,217
Less: allowance for doubtful accounts (9,294) (11,344)
Total accounts receivable, net 39,020 52,873
U.S. wireless, Retail    
ACCOUNTS RECEIVABLE    
Accounts receivable 23,805 21,367
U.S. wireless, Wholesale    
ACCOUNTS RECEIVABLE    
Accounts receivable 24,341 41,245
Other    
ACCOUNTS RECEIVABLE    
Accounts receivable $ 168 $ 1,605