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REVENUE RECOGNITION AND RECEIVABLES - Timing of Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	$ 166,484	$ 169,366	$ 331,123	$ 342,274
Operating lease income	2,048	2,111	4,031	4,217
Government support revenue	12,768	11,804	25,440	23,585
Total revenue	181,300	183,281	360,594	370,076
Services transferred over time
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	159,670	162,100	317,891	328,703
Goods and services transferred at point in time
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	6,814	7,266	13,232	13,571
International Telecom
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	93,304	93,889	186,332	185,483
Operating lease income	221	75	376	147
Government support revenue	1,370	1,393	2,682	2,786
Total revenue	94,895	95,357	189,390	188,416
International Telecom | Services transferred over time
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	90,196	90,271	179,712	178,831
International Telecom | Goods and services transferred at point in time
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	3,108	3,618	6,620	6,652
US Telecom
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	73,180	75,477	144,791	156,791
Operating lease income	1,827	2,036	3,655	4,070
Government support revenue	11,398	10,411	22,758	20,799
Total revenue	86,405	87,924	171,204	181,660
US Telecom | Services transferred over time
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	69,474	71,829	138,179	149,872
US Telecom | Goods and services transferred at point in time
REVENUE RECOGNITION AND RECEIVABLES
Total revenue accounted for under ASC 606	$ 3,706	$ 3,648	$ 6,612	$ 6,919

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