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REVENUE RECOGNITION AND RECEIVABLES - Timing of Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	$ 164,639	$ 172,908
Operating lease income	1,983	2,106
Government support revenue (1)	12,672	11,780
Total revenue	179,294	186,794
Services transferred over time
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	158,221	166,603
Good and services transferred at point in time
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	6,418	6,305
International Telecom
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	93,028	91,594
Operating lease income	155	72
Government support revenue (1)	1,312	1,393
Total revenue	94,495	93,059
International Telecom | Services transferred over time
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	89,516	88,560
International Telecom | Good and services transferred at point in time
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	3,512	3,034
US Telecom
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	71,611	81,314
Operating lease income	1,828	2,034
Government support revenue (1)	11,360	10,387
Total revenue	84,799	93,735
US Telecom | Services transferred over time
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	68,705	78,043
US Telecom | Good and services transferred at point in time
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	$ 2,906	$ 3,271

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