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Property and equipment: | 12 Months Ended
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Dec. 31, 2024
Property and equipment: |
Property and equipment: | 2. Property and equipment: Property and equipment consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2024 |  | 2023
Owned assets: | ​ | ​ | ​ | ​ | ​ | ​
Network equipment | ​ | $ | 1,085,979 | ​ | $ | 983,996
Owned buildings and leasehold improvements | ​ |  | 470,713 | ​ | ​ | 444,187
System infrastructure (including owned fiber) | ​ |  | 651,621 | ​ | ​ | 607,060
Software | ​ |  | 13,780 | ​ | ​ | 12,747
Office and other equipment | ​ |  | 29,030 | ​ | ​ | 26,656
Land | ​ |  | 135,871 | ​ | ​ | 135,877
Asset retirement obligations | ​ |  | 31,965 | ​ | ​ | 34,951
​ | ​ |  | 2,418,959 | ​ | ​ | 2,245,474
Less—Accumulated depreciation and amortization | ​ |  | (1,350,672) | ​ | ​ | (1,124,385)
​ | ​ |  | 1,068,287 | ​ | ​ | 1,121,089
Assets under finance leases: | ​ | ​ | ​ | ​ | ​ | ​
IRUs | ​ |  | 900,772 | ​ | ​ | 701,902
Less—Accumulated depreciation and amortization | ​ |  | (304,892) | ​ | ​ | (285,174)
​ | ​ |  | 595,880 | ​ | ​ | 416,728
Property and equipment, net | ​ | $ | 1,664,167 | ​ | $ | 1,537,817
​ Depreciation and amortization expense related to property and equipment and finance leases was $296.2 million, $229.9 million and $92.2 million, for the years ended December 31, 2024, 2023 and 2022, respectively. The Company capitalizes the compensation cost of employees directly involved with its construction activities. In the years ended December 31, 2024, 2023 and 2022, the Company capitalized compensation costs of $45.9 million, $35.5 million and $12.6 million, respectively. These amounts are included in system infrastructure costs.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477798/958-360-50-7 + Details
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