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REVENUE RECOGNITION AND RECEIVABLES - Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Contract Assets and Liabilities    
Retail revenue period for billing postpaid customers in advance 1 month  
Contract Asset - current $ 3,701 $ 3,616
Change in contract asset - current $ 85  
% of change in contract asset - current 2.40%  
Contract Asset - noncurrent $ 5,149 5,509
Change in contract asset - noncurrent $ (360)  
% of change in contract asset - noncurrent (6.50%)  
Contract liability- current $ (32,283) (30,990)
Change in contract liabilities - current $ (1,293)  
% of change in contract liabilities - current 4.20%  
Contract liability- noncurrent $ (59,373) (64,035)
Change in contract liabilities - noncurrent $ 4,662  
% of change in contract liabilities - Noncurrent (7.30%)  
Net contract liability $ (82,806) $ (85,900)
Change in net contract liability $ 3,094  
% of change in net contract liability (3.60%)  
Revenue recognized related to contract liability $ 22,200  
Amortization of contract assets $ 2,500