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REVENUE RECOGNITION AND RECEIVABLES - Timing of Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	$ 166,927	$ 164,602	$ 498,051	$ 506,876
Operating lease income	2,474	2,075	6,505	6,293
Government support revenue	13,764	11,774	39,204	35,358
Total revenue	183,165	178,451	543,760	548,527
Services transferred over time
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	160,627	158,995	478,519	487,698
Goods and services transferred at point in time
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	6,300	5,607	19,532	19,178
International Telecom
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	93,577	92,730	279,909	278,213
Operating lease income	203	157	579	304
Government support revenue	1,363	1,394	4,045	4,180
Total revenue	95,143	94,281	284,533	282,697
International Telecom | Services transferred over time
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	89,842	89,139	269,554	267,970
International Telecom | Goods and services transferred at point in time
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	3,735	3,591	10,355	10,243
US Telecom
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	73,350	71,872	218,142	228,663
Operating lease income	2,271	1,918	5,926	5,989
Government support revenue	12,401	10,380	35,159	31,178
Total revenue	88,022	84,170	259,227	265,830
US Telecom | Services transferred over time
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	70,785	69,856	208,965	219,728
US Telecom | Goods and services transferred at point in time
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	$ 2,565	$ 2,016	$ 9,177	$ 8,935

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