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Property, Equipment and Software, Net (Notes)
 12 Months Ended
Dec. 31, 2014
Property, Equipment and Software, Net [Abstract]  
Property, Equipment and Software Disclosure [Text Block]
PROPERTY, EQUIPMENT AND SOFTWARE, NET
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.    
Property, equipment and software are stated at cost and assets under capital leases are stated at the present value of minimum lease payments. Depreciation expense is recorded on a straight-line basis over the estimated useful lives of the assets (generally three years for computer hardware, purchased software and office and telephone equipment, five to ten years for furniture and fixtures and warehouse equipment, and the shorter of the term of the lease or the asset's useful life for leasehold improvements) and is primarily classified within "Selling, general and administrative" on the consolidated statements of operations. Depreciation and amortization expense on property, equipment and software, including internally-developed software, was $97.8 million, $67.8 million and $35.9 million for the years ended December 31, 2014, 2013 and 2012, respectively. These amounts include amortization expense of $7.2 million and $2.1 million on assets under capital leases for the years ended December 31, 2014 and 2013, respectively. Amortization expense recognized for assets under capital leases was not material for the year ended December 31, 2012. See Note 8, "Commitments and Contingencies" for further detail regarding capital leases.
As of December 31, 2014 and 2013, the carrying amount of internally-developed software, net of accumulated amortization, was $61.8 million and $47.9 million, respectively. Amortization expense for capitalized internally-developed software was $42.1 million, $25.2 million and $3.4 million for the years ended December 31, 2014, 2013 and 2012, respectively. For the year ended December 31, 2014, $11.7 million and $30.4 million of amortization expense for capitalized internally-developed software is included within "Cost of revenue" and "Selling, general and administrative," respectively, on the consolidated statements of operations. For the year ended December 31, 2013, $7.9 million and $17.3 million of amortization expense for capitalized internally-developed software is included within "Cost of revenue" and "Selling, general and administrative," respectively, on the consolidated statements of operations. For the year ended December 31, 2012, amortization expense for capitalized internally-developed software is primarily included within "Selling, general and administrative."