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Property and equipment: (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Owned assets:
Property and equipment, gross	$ 3,319,731	$ 2,947,376
Accumulated depreciation and amortization	(1,655,564)	(1,409,559)
Total property and equipment, net	1,664,167	1,537,817
Assets under finance leases:
Property and equipment, net	1,664,167	1,537,817
Depreciation and amortization expense			$ 92,222
Owned assets
Owned assets:
Property and equipment, gross	2,418,959	2,245,474
Accumulated depreciation and amortization	(1,350,672)	(1,124,385)
Total property and equipment, net	1,068,287	1,121,089
Network equipment | Owned assets
Owned assets:
Property and equipment, gross	1,085,979	983,996
Owned buildings and leasehold improvements | Owned assets
Owned assets:
Property and equipment, gross	470,713	444,187
System infrastructure (including owned fiber) | Owned assets
Owned assets:
Property and equipment, gross	651,621	607,060
Assets under finance leases:
Capitalized compensation costs	45,900	35,500	$ 12,600
Software | Owned assets
Owned assets:
Property and equipment, gross	13,780	12,747
Office and other equipment | Owned assets
Owned assets:
Property and equipment, gross	29,030	26,656
Land | Owned assets
Owned assets:
Property and equipment, gross	135,871	135,877
Asset retirement obligations | Owned assets
Owned assets:
Property and equipment, gross	31,965	34,951
IRU Finance Lease Agreement
Assets under finance leases:
IRUs	900,772	701,902
Less-Accumulated depreciation and amortization	(304,892)	(285,174)
IRUs, Net	$ 595,880	$ 416,728

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