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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 | (7) Property and Equipment Property and equipment (in thousands) consisted of the following, as of:
|  | December 31, |
|  | 2020 |  |  | 2019 |
Transportation equipment |  | $ | 48,645 |  |  | $ | 48,645 |
Computer equipment and purchased software |  |  | 61,299 |  |  |  | 58,920 |
Furniture and equipment |  |  | 10,460 |  |  |  | 10,464 |
Leasehold improvements |  |  | 31,403 |  |  |  | 31,023 |
Internally developed software |  |  | 9,917 |  |  |  | 9,849 |
Property and equipment, gross |  |  | 161,724 |  |  |  | 158,901 |
Less: accumulated depreciation and amortization |  |  | (118,749 | ) |  |  | (108,747 | )
Property and equipment, net |  | $ | 42,975 |  |  | $ | 50,154 |
Included in transportation equipment is the Company’s corporate aircraft, including capitalizable costs related to the repairs to the aircraft, and aircraft-related equipment. As of December 31, 2020, the net carrying value of the aircraft and aircraft-related equipment was $30.0 million, net of $18.6 million of accumulated depreciation. As of December 31, 2019, the net carrying value of the aircraft and aircraft-related equipment was $32.6 million, net of $16.0 million of accumulated depreciation. Depreciation and amortization expenses related to property and equipment were $11.4 million, $11.7 million, and $8.3 million for the years ended December 31, 2020, 2019, and 2018, 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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