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Property and Equipment | 12 Months Ended
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Dec. 31, 2023
Property and Equipment |
Property and Equipment | 5. Property and Equipment Property and equipment consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | As of December 31,
​ | ​ | 2023 |  | 2022
Land | ​ | $ | 5,098 | ​ | $ | 5,098
Land improvements | ​ |  | 2,242 | ​ |  | 2,242
Buildings | ​ |  | 51,399 | ​ |  | 51,399
Buildings and leasehold improvements | ​ |  | 34,210 | ​ |  | 21,911
Computer equipment | ​ |  | 138,950 | ​ |  | 119,316
Furniture, fixtures and equipment | ​ |  | 26,737 | ​ |  | 21,323
Internally developed software | ​ |  | 71,204 | ​ |  | 58,904
Construction in progress | ​ |  | 10,274 | ​ |  | 16,336
​ | ​ |  | 340,114 | ​ |  | 296,529
Less accumulated depreciation and amortization | ​ |  | (170,415) | ​ |  | (149,025)
Property and equipment, net | ​ | $ | 169,699 | ​ | $ | 147,504
​ Depreciation expense associated with property and equipment totaled $23,106, $22,115 and $21,441 for the years ended December 31, 2023, 2022, and 2021, respectively.

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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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