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PROPERTY AND EQUIPMENT (Tables) | 12 Months Ended
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Dec. 31, 2019
Property, Plant and Equipment [Abstract] |
Schedule of property and equipment | Depreciation and amortization are calculated on a straight-line basis over the following estimated useful lives of the assets:
Leasehold improvements |  | Shorter of lease term or useful life
Computer hardware and software |  | Three to five years
Furniture and office equipment |  | Five to ten years
Vehicles |  | Five years
Aircraft |  | Ten to twenty years
Property and equipment consists of the following (in thousands):
| December 31,
| 2019 |  | 2018
Leasehold improvements | $ | 73,918 |  |  | $ | 65,332 |
Furniture, office equipment and vehicles | 60,768 |  |  | 50,224 |
Computer hardware and software | 80,947 |  |  | 74,742 |
Aircraft | 27,657 |  |  | 2,796 |
Property and equipment, gross | 243,290 |  |  | 193,094 |
Accumulated depreciation and amortization | (135,761 | ) |  | (109,791 | )
Property and equipment, net | $ | 107,529 |  |  | $ | 83,303 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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