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Property and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2018
Property and Equipment [Abstract] |
Composition of property and equipment | The composition of property and equipment as of December 31, 2017 and 2018 is as follows (in thousands):
|  |  |  |  |  |  |  | Estimated useful |
|  | 2017 |  | 2018 |  | life (years) |
Land |  | $ | 7,138 |  | $ | 7,138 |  | — |
Buildings and improvements |  |  | 20,739 |  |  | 20,883 |  | 5-40 |
Furniture and office equipment |  |  | 76,726 |  |  | 76,856 |  | 5-7 |
Computer hardware |  |  | 10,970 |  |  | 13,546 |  | 3-7 |
Computer software |  |  | 80,662 |  |  | 129,519 |  | 3-10 |
Leasehold improvements |  |  | 42,915 |  |  | 44,215 |  | 3-10 |
Construction in progress |  |  | 4,914 |  |  | 8,354 |  | — |
|  |  | 244,064 |  |  | 300,511 |  |  |
Accumulated depreciation and amortization |  |  | (170,301) |  |  | (177,834) |  |  |
|  | $ | 73,763 |  | $ | 122,677 |  |  |

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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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