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Property and Equipment | 12 Months Ended
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Dec. 31, 2018
Property and Equipment |
Property and Equipment | 6. Property and Equipment Property and equipment consist of the following:
|  | As of December 31, |
|  | 2018 |  | 2017 |
Land |  | $ | 5,579 |  | $ | 160,126 |
Land improvements |  |  | 2,242 |  |  | 25,630 |
Buildings |  |  | 51,409 |  |  | 595,384 |
Buildings and leasehold improvements |  |  | 9,581 |  |  | 117,460 |
Equipment under capital leases |  |  | — |  |  | 5,937 |
Computer equipment |  |  | 85,316 |  |  | 116,477 |
Furniture, fixtures and equipment |  |  | 4,955 |  |  | 63,470 |
Internally developed software |  |  | 39,270 |  |  | 36,173 |
Other |  |  | — |  |  | 1,176 |
Construction in progress |  |  | 2,376 |  |  | 32,390 |
|  |  | 200,728 |  |  | 1,154,223 |
Less accumulated depreciation and amortization |  |  | (89,689) |  |  | (231,939) |
Property and equipment, net |  | $ | 111,039 |  | $ | 922,284 |
Depreciation and amortization expense associated with property and equipment, including assets under capital lease, totaled $ 35,525, $53,607, and $44,829 for the years ended December 31, 2018, 2017, and 2016, respectively.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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