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Property, Equipment and Software, Net Property, Equipment and Software (Tables) | 12 Months Ended
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Dec. 31, 2014
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment [Table Text Block] | The following summarizes the Company's property, equipment and software, net (in thousands):
|  | December 31,
|  | 2014 |  | 2013
Warehouse equipment |  | $ | 4,859 |  |  | $ | 3,997 |
Furniture and fixtures |  | 18,610 |  |  | 13,526 |
Leasehold improvements |  | 39,900 |  |  | 35,830 |
Office and telephone equipment |  | 4,448 |  |  | 5,062 |
Purchased software |  | 40,448 |  |  | 22,499 |
Computer hardware(1) |  | 135,731 |  |  | 84,673 |
Internally-developed software |  | 133,598 |  |  | 79,113 |
Total property, equipment and software, gross |  | 377,594 |  |  | 244,700 |
Less: accumulated depreciation and amortization |  | (195,119 | ) |  | (110,277 | )
Property, equipment and software, net |  | $ | 182,475 |  |  | $ | 134,423 |
(1) | Includes computer hardware acquired under capital leases of $48.0 million and $11.8 million as of December 31, 2014 and 2013, respectively.

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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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 + Details
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