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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 consists of the following (dollars in thousands):
|  |  | December 31,
| Useful Lives |  | 2020 |  | 2019
Computer hardware and software | 2-10 years |  | $ | 974,490 |  |  | $ | 931,891 |
Leasehold improvements | 1-15 years |  | 554,252 |  |  | 510,917 |
Furniture and equipment | 1-10 years |  | 243,880 |  |  | 334,625 |
Construction in progress | N/A |  | 117,274 |  |  | 129,671 |
Total cost |  |  | 1,889,896 |  |  | 1,907,104 |
Less: Accumulated depreciation and amortization |  |  | 1,074,887 |  |  | 1,070,898 |
Property and equipment, net |  |  | $ | 815,009 |  |  | $ | 836,206 |
Depreciation and amortization expense associated with property and equipment was $268.3 million, $207.8 million and $192.8 million for the years ended December 31, 2020, 2019 and 2018, respectively. During the year ended December 31, 2020, we recorded $29.2 million in asset impairment charges related to property and equipment (see Note 7). Construction in progress includes capitalizable costs incurred during the development stage of computer software and leasehold improvements that have not yet been placed in service.

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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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