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Property and Equipment, Net | 12 Months Ended
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Dec. 31, 2022
Property, Plant and Equipment [Abstract] |
Property and Equipment, Net | PROPERTY AND EQUIPMENT, NET Property and equipment are stated at cost, net of accumulated depreciation and amortization. The costs of additions and improvements are capitalized, while maintenance and repairs are charged to expense as incurred. When an item is sold or retired, the cost and related accumulated depreciation are relieved, and the resulting gain or loss, if any, is recognized in the consolidated statements of income. We evaluate our property and equipment for impairment periodically or as changes in circumstances or the occurrence of events suggest the remaining value is not recoverable from future cash flows. If the carrying value of our property and equipment is impaired, an impairment charge is recorded for the amount by which the carrying value of the property and equipment exceeds its fair value. We provide for depreciation and amortization primarily using the straight-line method by charges to the consolidated statements of income in amounts that allocate the cost of property and equipment over their estimated useful lives as follows:
Asset Classification |  | Estimated Useful Life
Land improvements |  | 15 to 20 years
Buildings and improvements |  | 10 to 40 years
Leasehold improvements |  | Shorter of remaining lease term or useful life of improvements
Machinery and equipment |  | 3 to 8 years
Office furniture and equipment |  | 3 to 7 years
Computer hardware and software |  | 3 to 7 years
We capitalize interest on the acquisition and construction of significant assets that require a substantial period of time to be made ready for use. The capitalized interest is included in the cost of the completed asset and depreciated over the asset’s estimated useful life. The amount of interest capitalized during the years ended December 31, 2022 and 2021, was not material. We capitalize certain costs incurred in connection with developing or obtaining software designated for internal use based on three distinct stages of development. Qualifying costs incurred during the application development stage, which consist primarily of internal payroll and direct fringe benefits and external direct project costs, including labor and travel, are capitalized and amortized on a straight-line basis over the estimated useful life of the asset. Costs incurred during the preliminary project and post-implementation and operation phases are expensed as incurred. These costs relate primarily to the determination of performance requirements, data conversion, and training. Software developed to deliver hosted services to our customers has been designated as internal use. Property and equipment, net, consisted of the following:
(in thousands) |  | December 31, 2022 |  | December 31, 2021
Land and improvements |  | $ | 22,221 |  |  | $ | 22,642 |
Buildings and improvements |  | 356,049 |  |  | 329,091 |
Leasehold improvements |  | 107,251 |  |  | 93,248 |
Machinery and equipment |  | 404,963 |  |  | 382,753 |
Office furniture and equipment |  | 71,625 |  |  | 69,090 |
Computer hardware and software |  | 295,969 |  |  | 276,895 |
Construction in progress |  | 97,310 |  |  | 62,339 |
|  | 1,355,388 |  |  | 1,236,058 |
Less accumulated depreciation and amortization |  | 705,914 |  |  | 648,391 |
Total property and equipment, net |  | $ | 649,474 |  |  | $ | 587,667 |
Below are the amounts of depreciation and amortization of property and equipment, capitalized computer software for internal use, unpaid property and equipment reflected in accounts payable and accrued expenses, and rental and reagent rental program instruments transferred from inventory to property and equipment:
|  | For the Years Ended December 31,
(in thousands) |  | 2022 |  | 2021 |  | 2020
Depreciation and amortization expense |  | $ | 96,746 |  |  | $ | 92,376 |  |  | $ | 86,095 |
Capitalized computer software developed for internal use |  | $ | 20,329 |  |  | $ | 14,753 |  |  | $ | 18,472 |
Unpaid property and equipment, reflected in accounts payable and accrued liabilities |  | $ | 18,334 |  |  | $ | 19,326 |  |  | $ | 13,343 |
Rental and operating-type reagent rental program instruments transferred from inventory to property and equipment (Note 3) |  | $ | 17,407 |  |  | $ | 11,628 |  |  | $ | 9,645 |
We had no material impairments for the years ended December 31, 2022 or 2020. We had impairments of $5.1 million for the year ended December 31, 2021, associated with a write-down of rental assets in certain regions.

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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 https://asc.fasb.org/extlink&oid=126982197&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI https://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 https://asc.fasb.org/extlink&oid=126982197&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 https://asc.fasb.org/extlink&oid=126982197&loc=d3e99779-112916 + Details
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