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Property and Equipment, Net (Details Textual) (USD $)	12 Months Ended
Property and Equipment, Net (Details Textual) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property and Equipment, Net (Textual) [Abstract]
Capitalized computer software and website development costs, net of accumulated amortization	$ 43,802,000	$ 34,754,000
Depreciation of property and equipment, including internal-use software and website development costs	19,966,000	18,362,000	12,871,000
Capitalized software and website development [Member]
Property and Equipment, Net (Textual) [Abstract]
Capitalized computer software and website development costs, net of accumulated amortization	28,400,000	21,000,000
Capitalized computer software and website development costs	20,200,000	16,300,000
Depreciation of property and equipment, including internal-use software and website development costs	12,800,000	12,400,000	8,100,000
Property and equipment write off	25,400,000
Accumulated depreciation	25,200,000
Loss on property and equipment written off	$ 200,000

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, 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.

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