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Property and Equipment | 12 Months Ended
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Dec. 31, 2021
Property and Equipment |
Property and Equipment | ​ 7. Property and Equipment ​ Property and equipment consist of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | As of December 31, |
​ | ​ | 2021 |  | 2020 | ​
Land | ​ | $ | 5,579 | ​ | $ | 5,579 | ​
Land improvements | ​ |  | 2,242 | ​ |  | 2,242 | ​
Buildings | ​ |  | 51,399 | ​ |  | 51,399 | ​
Buildings and leasehold improvements | ​ |  | 17,161 | ​ |  | 14,352 | ​
Computer equipment | ​ |  | 113,680 | ​ |  | 100,575 | ​
Furniture, fixtures and equipment | ​ |  | 17,921 | ​ |  | 15,439 | ​
Internally developed software | ​ |  | 55,083 | ​ |  | 46,981 | ​
Construction in progress | ​ |  | 3,381 | ​ |  | 5,043 | ​
​ | ​ |  | 266,446 | ​ |  | 241,610 | ​
Less accumulated depreciation and amortization | ​ |  | (130,326) | ​ |  | (112,953) | ​
Property and equipment, net | ​ | $ | 136,120 | ​ | $ | 128,657 | ​
​ Depreciation expense associated with property and equipment totaled $21,441, $20,830 and $18,393 for the years ended December 31, 2021, 2020 and 2019, 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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