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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 | 6. PROPERTY AND EQUIPMENT (1)
(in thousands) | December 31,
2020 |  | 2019
Leasehold improvements | $ | 52,335 |  |  | $ | 42,162 |
Computer equipment | 30,211 |  |  | 25,147 |
Furniture and fixtures | 10,572 |  |  | 8,524 |
Computer software purchased | 8,415 |  |  | 7,775 |
Computer software developed for internal use | 18,542 |  |  | 17,606 |
Fixed assets in progress | 2,077 |  |  | 4,044 |
| 122,152 |  |  | 105,258 |
Less: accumulated depreciation | (81,754) |  |  | (70,975) |
| $ | 40,398 |  |  | $ | 34,283 |
(1) Included in other long-term assets.
(in thousands) | 2020 |  | 2019 |  | 2018
Depreciation expense | $ | 17,378 |  |  | $ | 14,771 |  |  | $ | 13,875 |

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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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