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Property, Equipment and Software, Net Property, Equipment and Software (Tables)
 12 Months Ended
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.