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Property and Equipment | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Property and Equipment | Property and equipment Property and equipment were comprised of the following:
| December 31,
| 2020 |  | 2019
Land | $ | 37,924 |  |  | $ | 36,480 |
Buildings | 400,616 |  |  | 392,256 |
Leasehold improvements | 3,865,729 |  |  | 3,545,224 |
Equipment and information systems, including internally developed software | 3,081,298 |  |  | 2,880,645 |
New center and capital asset projects in progress | 616,686 |  |  | 588,345 |
| 8,002,253 |  |  | 7,442,950 |
Less accumulated depreciation | (4,480,429) |  |  | (3,969,566) |
| $ | 3,521,824 |  |  | $ | 3,473,384 |
Depreciation and amortization expenses are computed using the straight-line method over the useful lives of the assets estimated as follows: buildings, 25 years to 40 years; leasehold improvements, the shorter of ten years or the expected lease term; and equipment and information systems, principally three years to 15 years. Depreciation expense on property and equipment was $616,626, $600,905, and $574,799 for 2020, 2019 and 2018, respectively. Interest on debt incurred during the development of new centers and other capital asset projects is capitalized as a component of the asset cost based on the respective in-process capital asset balances. Interest capitalized was $17,944, $27,322 and $25,978 for 2020, 2019 and 2018, respectively. During 2018, the Company recognized asset impairment charges of $17,338 related to the restructuring of its pharmacy business.

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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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