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Property and Equipment | 12 Months Ended
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Dec. 31, 2017
Property and Equipment [Abstract] |
Property and Equipment | 5. Property and Equipment The composition of property and equipment as of December 31, 2016 and 2017 is as follows (in thousands):
|  |  |  |  |  |  |  | Estimated useful |
|  | 2016 |  | 2017 |  | life (years) |
Land |  | $ | 7,138 |  | $ | 7,138 |  | — |
Buildings and improvements |  |  | 19,238 |  |  | 19,304 |  | 5-40 |
Furniture, equipment, and computer hardware and software |  |  | 157,104 |  |  | 169,613 |  | 5-10 |
Leasehold improvements |  |  | 39,769 |  |  | 42,906 |  | 3-10 |
Construction in progress |  |  | 7,006 |  |  | 5,103 |  |  |
|  |  | 230,255 |  |  | 244,064 |  |  |
Accumulated depreciation and amortization |  |  | (157,131) |  |  | (170,301) |  |  |
|  | $ | 73,124 |  | $ | 73,763 |  |  |
Construction in progress includes costs associated with the construction and renovation of campuses and the development of information technology applications. In 2016 and 2017, the Company recorded leasehold improvements of $0.3 million and $1.2 million, respectively, which were reimbursed by lessors as lease incentives. In 2016 and 2017, the Company wrote off $3.2 million and $5.3 million, respectively, in fixed assets that were fully depreciated and no longer in service.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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