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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Advertising Costs | Advertising costs for the years ended December 31, 2017, 2016 and 2015, are reflected in the following table (in thousands):
|  | Years Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Advertising Costs |  | $ | 49,433 |  |  | $ | 47,312 |  |  | $ | 44,015 |
Depreciation Expense Computed Using Straight-Line Method over Useful Lives | Depreciation expense is computed using the straight-line method over the following useful lives:
Computer hardware | 2 to 3 years
Computer software | 2 to 5 years
Furniture and equipment | 5 years
Leasehold improvements | Term of lease, 5 years maximum
Property and equipment consisted of the following (in thousands):
|  | December 31,
|  | 2017 |  | 2016
Computer hardware |  | $ | 171,515 |  |  | $ | 170,746 |
Computer software |  | 376,761 |  |  | 374,490 |
Furniture and equipment |  | 102,424 |  |  | 100,472 |
Leasehold improvements |  | 148,764 |  |  | 133,541 |
Other |  | 9,907 |  |  | 9,993 |
Property and equipment, cost |  | 809,371 |  |  | 789,242 |
Accumulated depreciation |  | (664,484 | ) |  | (627,733 | )
Property and equipment, net |  | $ | 144,887 |  |  | $ | 161,509 |
Internal-Use Software Development Costs Capitalized | Internal-use software development costs capitalized for the years ended December 31, 2017, 2016 and 2015, are reflected in the following table (in thousands):
|  | Years Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Internal-use software development costs |  | $ | 9,030 |  |  | $ | 33,753 |  |  | $ | 31,964 |

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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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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