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Property and Equipment, Net (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Components of property and equipment
Property and equipment, gross	$ 81,221	$ 76,707
Less: accumulated depreciation	(37,626)	(43,391)
Projects in progress	207	1,438
Property and equipment, net	43,802	34,754
Capitalized software and website development [Member]
Components of property and equipment
Property and equipment, gross	48,527	46,878
Property and equipment, net	28,400	21,000
Leasehold improvements [Member]
Components of property and equipment
Property and equipment, gross	14,244	12,924
Computer equipment [Member]
Components of property and equipment
Property and equipment, gross	13,174	11,638
Furniture and other equipment [Member]
Components of property and equipment
Property and equipment, gross	$ 5,276	$ 5,267

X

- Definition

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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-Paragraph 5

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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X

- Definition

Gross amount, at the balance sheet date, of long-lived assets under construction that include construction costs to date on capital projects that have not been completed and assets being constructed that are not ready to be placed into service.

+ References

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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+ References

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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