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Property and Equipment | 12 Months Ended
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Dec. 31, 2023
Property, Plant and Equipment [Abstract] |
Property and Equipment | (6) Property and Equipment Property and equipment (in thousands) consisted of the following, as of:
|  | December 31, |
|  | 2023 |  |  | 2022 |
Corporate aircraft and related equipment |  | $ | 48,645 |  |  | $ | 48,645 |
Computer equipment and purchased software |  |  | 60,979 |  |  |  | 60,375 |
Furniture and equipment |  |  | 9,920 |  |  |  | 9,936 |
Leasehold improvements |  |  | 29,944 |  |  |  | 28,755 |
Internally developed software |  |  | 9,917 |  |  |  | 9,917 |
Property and equipment, gross |  |  | 159,405 |  |  |  | 157,628 |
Less: accumulated depreciation and amortization |  |  | (130,464 | ) |  |  | (125,317 | )
Property and equipment, net |  | $ | 28,941 |  |  | $ | 32,311 |
Depreciation and amortization expenses related to property and equipment were $6.4 million, $6.7 million, and $8.7 million for the years ended December 31, 2023, 2022, and 2021, 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://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-7 + Details
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