Property and equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Owned assets:
Property and equipment, gross	$ 2,947,376	$ 1,714,906
Accumulated depreciation and amortization	(1,409,559)	(1,170,476)
Total property and equipment, net	1,537,817	544,430
Assets under finance leases:
Total property and equipment, net	1,537,817	544,430
Depreciation and amortization expense		92,222	$ 89,240
Owned assets
Owned assets:
Property and equipment, gross	2,245,474	1,148,623
Accumulated depreciation and amortization	(1,124,385)	(949,277)
Total property and equipment, net	1,121,089	199,346
Network equipment | Owned assets
Owned assets:
Property and equipment, gross	983,996	673,479
Leasehold improvements | Owned assets
Owned assets:
Property and equipment, gross	297,785	263,861
System infrastructure | Owned assets
Owned assets:
Property and equipment, gross	607,060	171,694
Assets under finance leases:
Capitalized compensation cost	35,500	12,600	$ 13,400
Software | Owned assets
Owned assets:
Property and equipment, gross	12,747	11,277
Office and other equipment | Owned assets
Owned assets:
Property and equipment, gross	26,656	22,071
Owned buildings | Owned assets
Owned assets:
Property and equipment, gross	146,402	6,140
Land | Owned assets
Owned assets:
Property and equipment, gross	135,877	101
Asset Retirement Obligation | Owned assets
Owned assets:
Property and equipment, gross	34,951
Indefeasible rights of use (IRUs)
Assets under finance leases:
IRUs	701,902	566,283
Less- Accumulated depreciation and amortization	285,174	221,199
IRUs, Net	$ 416,728	$ 345,084