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REVENUE AND RECEIVABLES (Tables) | 12 Months Ended
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Dec. 31, 2023
REVENUE AND RECEIVABLES |
Summary of revenues | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Year Ended
​ | 2023 | ​ | 2022 | ​ | 2021
Services transferred over time | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
US Telecom | $ | 326,966 | ​ | $ | 301,309 | ​ | $ | 188,405
International Telecom | ​ | 347,769 | ​ | ​ | 332,507 | ​ | ​ | 319,357
Solar | ​ | - | ​ | ​ | - | ​ | ​ | 418
Total | ​ | 674,735 | ​ | ​ | 633,816 | ​ | ​ | 508,180
Goods and services transferred at a point in time | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
US Telecom | ​ | 18,059 | ​ | ​ | 29,203 | ​ | ​ | 46,433
International Telecom | ​ | 17,086 | ​ | ​ | 14,934 | ​ | ​ | 10,928
Total | ​ | 35,145 | ​ | ​ | 44,137 | ​ | ​ | 57,361
Total revenue accounted for under ASC 606 | ​ | 709,880 | ​ | ​ | 677,953 | ​ | ​ | 565,541
Summary of contracts asset and liabilities | Contract assets and liabilities consisted of the following (amounts in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | December 31, 2023 | ​ | December 31, 2022 | ​ | ​ | $ Change | ​ | % Change
Contract asset – current | $ | 3,616 | ​ | $ | 2,932 | ​ | $ | 684 | ​ | ​ | 23.3 | %
Contract asset – noncurrent | ​ | 5,509 | ​ | ​ | 3,775 | ​ | ​ | 1,734 | ​ | ​ | 45.9 | %
Contract liability – current | ​ | (30,990) | ​ | ​ | (27,284) | ​ | ​ | (3,706) | ​ | ​ | 13.6 | %
Contract liability – noncurrent | ​ | (64,035) | ​ | ​ | (72,543) | ​ | ​ | 8,508 | ​ | ​ | (11.7) | %
Net contract liability | $ | (85,900) | ​ | $ | (93,120) | ​ | $ | 7,220 | ​ | ​ | (7.8) | %
Schedule of activity in allowances for credit losses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended
​ |  | December 31, 2023 |  | December 31, 2022
​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period |  | $ | 15,171 | ​ | $ | 13,885
Current period provision for expected losses |  | ​ | 5,012 | ​ | ​ | 6,695
Write-offs charged against the allowance |  | ​ | (4,340) | ​ | ​ | (5,518)
Recoveries collected | ​ | ​ | 519 | ​ | ​ | 109
Balance at end of period | ​ | $ | 16,362 | ​ | $ | 15,171
​

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-10 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-5 + Details
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