GOODWILL AND INTANGIBLE ASSETS - Change In Carrying Amount Of Telecommunications Licenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Changes in the carrying amount of the company's telecommunications licenses, by operating segment
Balance at the beginning of the period	$ 114,083
Balance at the end of the period	113,766	$ 114,083
Telecommunications Licenses
Telecommunications licenses
Impairment of intangible assets		0	$ 0
Changes in the carrying amount of the company's telecommunications licenses, by operating segment
Balance at the beginning of the period	114,083	93,686
Acquired licenses	683	20,397
Dispositions	(1,000)
Transfers		0
Balance at the end of the period	113,766	114,083	93,686
Telecommunications Licenses | International Telecom
Changes in the carrying amount of the company's telecommunications licenses, by operating segment
Balance at the beginning of the period	34,798	23,347
Acquired licenses	0	200
Dispositions	0
Transfers		11,251
Balance at the end of the period	34,798	34,798	23,347
Telecommunications Licenses | US Telecom
Changes in the carrying amount of the company's telecommunications licenses, by operating segment
Balance at the beginning of the period	79,285	70,339
Acquired licenses	683	20,197
Dispositions	(1,000)
Transfers		(11,251)
Balance at the end of the period	$ 78,968	$ 79,285	$ 70,339