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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 | 8. PROPERTY AND EQUIPMENT The cost basis and estimated useful lives of property and equipment as of December 31, 2020 and 2019 are as follows (dollars in thousands):
|  | December 31, |  |  |
|  | 2020 (1) |  |  | 2019 (1) |  |  | Life
Computer hardware and software |  | $ | 40,587 |  |  | $ | 27,660 |  |  | 3 years
Leasehold improvements |  |  | 56,095 |  |  |  | 58,294 |  |  | Shorter of Life of Lease or Useful Life
Furniture, fixtures and equipment |  |  | 23,071 |  |  |  | 23,145 |  |  | 5-10 years
Building and improvements |  |  | 8,485 |  |  |  | 8,485 |  |  | 15-35 years
Library materials |  |  | 24 |  |  |  | 171 |  |  | 10 years
Vehicles |  |  | 56 |  |  |  | 56 |  |  | 5 years
Construction in progress |  |  | 823 |  |  |  | 1,128 |  |  |
|  |  | 129,141 |  |  |  | 118,939 |  |  |
Less-accumulated depreciation |  |  | (101,380 | ) |  |  | (92,933 | ) |  |
Total property and equipment, net |  | $ | 27,761 |  |  | $ | 26,006 |  |  |
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(1) | Property and equipment which were fully depreciated and no longer in use by the Company were retired during the years ended December 31, 2020 and 2019; therefore, both the cost of the asset and the related accumulated depreciation balances were reduced to zero for these assets.
Depreciation expense for the years ended December 31, 2020, 2019 and 2018 was $12.0 million, $9.1 million and $9.4 million, respectively.

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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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