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REVENUE AND RECEIVABLES - Timing of Revenue Recognition (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	$ 673,997	$ 709,880	$ 677,953
Operating lease income	8,372	7,777	6,253
Government grant revenue	46,706	44,559	41,539
Total revenue	729,075	762,216	725,745
Services transferred over time
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	646,899	674,735	633,816
Good and services transferred at point in time
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	27,098	35,145	44,137
International Telecom
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	371,508	364,855	347,441
Operating lease income	381	289	278
Government grant revenue	5,574	5,589	7,862
Total revenue	377,463	370,733	355,581
International Telecom | Services transferred over time
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	356,564	347,769	332,507
International Telecom | Good and services transferred at point in time
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	14,944	17,086	14,934
US Telecom
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	302,489	345,025	330,512
Operating lease income	7,991	7,488	5,975
Government grant revenue	41,132	38,970	33,677
Total revenue	351,612	391,483	370,164
US Telecom | Services transferred over time
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	290,335	326,966	301,309
US Telecom | Good and services transferred at point in time
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	$ 12,154	$ 18,059	$ 29,203

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