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v3.25.4

Geographic and segment information: (Tables) | 12 Months Ended
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Dec. 31, 2025
Geographic and segment information: |
Schedule of service revenues and long-lived assets by geographic region |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year Ended December 31, 2025 | ​ ​ ​ | On-net | ​ ​ ​ | Off-net | ​ ​ ​ | Wavelengths | ​ ​ ​ | Non-core | ​ ​ ​ | Total
North America | ​ | $ | 400,765 | ​ | $ | 373,289 | ​ | $ | 37,443 | ​ | $ | 8,026 | ​ | $ | 819,523
Europe | ​ | ​ | 101,395 | ​ | ​ | 19,455 | ​ | ​ | 944 | ​ | ​ | 217 | ​ | ​ | 122,011
Oceania | ​ |  | 20,791 | ​ | ​ | 3,916 | ​ | ​ | 66 | ​ | ​ | 63 | ​ | ​ | 24,836
South America | ​ | ​ | 8,072 | ​ | ​ | 708 | ​ | ​ | — | ​ | ​ | 28 | ​ | ​ | 8,808
Africa | ​ | ​ | 486 | ​ | ​ | 102 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 588
Total | ​ | $ | 531,509 | ​ | $ | 397,470 | ​ | $ | 38,453 | ​ | $ | 8,334 | ​ | $ | 975,766
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year Ended December 31, 2024 | ​ ​ ​ | On-net | ​ ​ ​ | Off-net | ​ | Wavelengths | ​ ​ ​ | Non-core | ​ ​ ​ | Total
North America | ​ | $ | 424,437 | ​ | $ | 426,857 | ​ | $ | 19,015 | ​ | $ | 17,692 | ​ | $ | 888,001
Europe | ​ |  | 94,363 | ​ | ​ | 21,242 | ​ | ​ | 172 | ​ | ​ | 347 | ​ | ​ | 116,124
Oceania | ​ |  | 18,205 | ​ | ​ | 5,013 | ​ | ​ | 9 | ​ | ​ | 91 | ​ | ​ | 23,318
South America | ​ | ​ | 7,080 | ​ | ​ | 896 | ​ | ​ | — | ​ | ​ | 43 | ​ | ​ | 8,019
Africa | ​ | ​ | 543 | ​ | ​ | 99 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 642
Total | ​ | $ | 544,628 | ​ | $ | 454,107 | ​ | $ | 19,196 | ​ | $ | 18,173 | ​ | $ | 1,036,104
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year Ended December 31, 2023 | ​ ​ ​ | On-net | ​ ​ ​ | Off-net | ​ | Wavelengths | ​ ​ ​ | Non-core | ​ ​ ​ | Total
North America | ​ | $ | 401,213 | ​ | $ | 367,210 | ​ | $ | 5,653 | ​ | $ | 28,614 | ​ | $ | 802,690
Europe | ​ |  | 88,310 | ​ | ​ | 19,913 | ​ | ​ | — | ​ | ​ | 147 | ​ | ​ | 108,370
Oceania | ​ |  | 15,769 | ​ | ​ | 5,587 | ​ | ​ | — | ​ | ​ | 71 | ​ | ​ | 21,427
South America | ​ | ​ | 6,957 | ​ | ​ | 684 | ​ | ​ | — | ​ | ​ | 8 | ​ | ​ | 7,649
Africa | ​ | ​ | 687 | ​ | ​ | 99 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 786
Total | ​ | $ | 512,936 | ​ | $ | 393,493 | ​ | $ | 5,653 | ​ | $ | 28,840 | ​ | $ | 940,922
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31,
​ | ​ ​ ​ | 2025 | ​ ​ ​ | 2024
Long lived assets, net | ​ | ​ | ​ | ​ | ​ | ​
North America | ​ | $ | 1,523,789 | ​ | $ | 1,579,495
Europe and other | ​ |  | 197,285 | ​ | ​ | 158,854
Total | ​ | $ | 1,721,074 | ​ | $ | 1,738,349
​

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- Definition Tabular disclosure of information concerning material long-lived assets (excluding financial instruments, customer relationships with financial institutions, mortgage and other servicing rights, deferred policy acquisition costs, and deferred taxes assets) located in identified geographic areas and/or the amount of revenue from external customers attributed to that country from which revenue is material. An entity may also provide subtotals of geographic information about groups of countries. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-41 + Details
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