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Property and Equipment | 12 Months Ended
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Dec. 31, 2018
Property, Plant and Equipment [Abstract] |
Property and Equipment | Property and equipment Property and equipment were comprised of the following:
| December 31,
| 2018 |  | 2017
Land | $ | 37,384 |  |  | $ | 33,814 |
Buildings | 467,181 |  |  | 473,489 |
Leasehold improvements | 3,164,943 |  |  | 2,816,675 |
Equipment and information systems, including internally developed software | 2,586,564 |  |  | 2,352,246 |
New center and capital asset projects in progress | 661,695 |  |  | 576,651 |
| 6,917,767 |  |  | 6,252,875 |
Less accumulated depreciation | (3,524,098 | ) |  | (3,103,662 | )
| $ | 3,393,669 |  |  | $ | 3,149,213 |
Depreciation expense on property and equipment was $574,799, $544,129, and $494,945 for 2018, 2017 and 2016, respectively. During 2018 and 2017, the Company recognized asset impairment charges of $17,338 and $15,168, respectively, related to the restructuring of its pharmacy business. 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 $25,978, $19,176 and $12,990 for 2018, 2017 and 2016, respectively.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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