GOVERNMENT SUPPORT AND SPECTRUM MATTERS - Communication Services Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Mobility Fund [Line Items]
Revenue from contract with customer	$ 164,639	$ 172,908
High cost support program | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	4,427	4,848
High cost support program | US Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	3,115	3,455
High cost support program | International Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	1,312	1,393
CAF II | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	8,170	6,787
CAF II | US Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	8,170	6,787
RDOF | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	75	145
RDOF | US Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	75	145
ECF | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer		6,813
ECF | US Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer		6,813
RHC | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	4,363	3,437
RHC | US Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	4,363	3,437
Other Programs | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	1,641	7,016
Other Programs | US Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	1,636	6,701
Other Programs | International Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	5	315
USF, CAF II, RDOF, ECF, RHC and Other Programs | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	18,676	29,046
USF, CAF II, RDOF, ECF, RHC and Other Programs | US Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	17,359	27,338
USF, CAF II, RDOF, ECF, RHC and Other Programs | International Telecom | Communication services
Mobility Fund [Line Items]
Revenue from contract with customer	$ 1,317	$ 1,708