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REVENUE RECOGNITION AND RECEIVABLES - Timing of Revenue Recognition (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Disaggregation of Revenue [Line Items]    
Total revenue $ 172,557 $ 159,912
Services transferred over time    
Disaggregation of Revenue [Line Items]    
Total revenue 166,752 153,592
Goods and services transferred at a point in time    
Disaggregation of Revenue [Line Items]    
Total revenue 5,805 6,320
Telecom | Services transferred over time    
Disaggregation of Revenue [Line Items]    
Total revenue 81,072 72,290
Telecom | Goods and services transferred at a point in time    
Disaggregation of Revenue [Line Items]    
Total revenue 2,546 3,597
International Telecom | Services transferred over time    
Disaggregation of Revenue [Line Items]    
Total revenue 85,680 81,302
International Telecom | Goods and services transferred at a point in time    
Disaggregation of Revenue [Line Items]    
Total revenue $ 3,259 $ 2,723