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REVENUE AND RECEIVABLES - Timing of Revenue Recognition (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
ASU 2014-09 |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | $ 677,953 | $ 565,541 | $ 428,685
Services transferred over time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 633,816 | 508,180 | 407,335
Goods and services transferred at a point in time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 44,137 | 57,361 | 21,350
Telecom | Services transferred over time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 301,309 | 188,405 | 96,935
Telecom | Goods and services transferred at a point in time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 29,203 | 46,433 | 12,154
International Telecom | Services transferred over time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 332,507 | 319,357 | 305,844
International Telecom | Goods and services transferred at a point in time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | $ 14,934 | 10,928 | 9,196
Solar | Services transferred over time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue |  | $ 418 | $ 4,556

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