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v3.25.1

Property and equipment: | 3 Months Ended
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Mar. 31, 2025
Property and equipment: |
Property and equipment: | 2. Property and equipment: Depreciation and amortization expense related to property and equipment and finance leases and capitalized compensation costs of employees directly involved with construction activities were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months |  | Three Months
​ | ​ | Ended | ​ | Ended
(in thousands) | ​ | March 31, 2025 | ​ | March 31, 2024
Depreciation and amortization expense | ​ | $ | 75,594 | ​ | $ | 70,842
Capitalized compensation cost | ​ |  | 12,521 | ​ | ​ | 11,697
​

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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//1943274/2147480321/958-360-50-6 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//1943274/2147480321/958-360-50-1 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//1943274/2147480321/958-360-50-7 + Details
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