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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, stated at cost, at December 31, 2020 and 2019 consisted of the following (in thousands):
| 2020 |  | 2019
Computers and related equipment | $ | 350,735 |  |  | $ | 334,768 |
Furniture and equipment | 2,721 |  |  | 1,977 |
Leasehold improvements | 9,010 |  |  | 17,374 |
| 362,466 |  |  | 354,119 |
Less: Accumulated depreciation and amortization | (205,889) |  |  | (226,302) |
Total property and equipment, net | $ | 156,577 |  |  | $ | 127,817 |
Depreciation and amortization expense was $63.8 million, $51.4 million and $41.3 million for the years ended December 31, 2020, 2019 and 2018, respectively. Total disposals of long-lived assets for the years ended December 31, 2020, 2019 and 2018 were $0.9 million, $0.3 million and $0.4 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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