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EQUIPMENT AND PROPERTY, NET | 12 Months Ended
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Dec. 31, 2022
EQUIPMENT AND PROPERTY, NET |
EQUIPMENT AND PROPERTY, NET | 5. EQUIPMENT AND PROPERTY, NET Equipment and property are presented at cost less accumulated depreciation and are detailed as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, |  | 2022 |  | 2021
(in thousands) |  | ​ |  |  | ​ |
Buildings | ​ | $ | 51,223 | ​ | $ | 54,935
Operating equipment | ​ |  | 132,411 | ​ |  | 126,732
Furniture and fixtures | ​ |  | 20,389 | ​ |  | 19,261
Computer equipment and systems | ​ |  | 233,108 | ​ |  | 223,648
​ | ​ |  | 437,131 | ​ |  | 424,576
Less: accumulated depreciation | ​ |  | (333,298) | ​ |  | (315,891)
​ | ​ |  | 103,833 | ​ |  | 108,685
Land | ​ |  | 24,213 | ​ |  | 24,572
Equipment and property, net | ​ | $ | 128,046 | ​ | $ | 133,257
​ Included in computer equipment and systems at December 31, 2022 and 2021, are costs for internal use software of $147.1 million and $143.5 million, respectively. The related accumulated depreciation was $117.3 million and $105.3 million at December 31, 2022 and 2021, respectively. ​ Included in equipment and property, net at December 31, 2022 and 2021, are fixed assets held in foreign countries of $9.5 million, and $8.4 million, respectively. Total depreciation expense was approximately $35.6 million in 2022, $40.6 million in 2021 and $40.6 million in 2020.

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