Property and Equipment Property and Equipment (Table) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Property and Equipment [Line Items]
Property and equipment	$ 14,192	$ 13,115
Accumulated depreciation	(8,924)	(7,641)
Property and equipment, net	5,268	5,474
Website development [Member]
Property and Equipment [Line Items]
Property and equipment, estimated life	3 years
Property and equipment	6,022	5,552
Computer equipment [Member]
Property and Equipment [Line Items]
Property and equipment, estimated life	3 years
Property and equipment	4,669	4,172
Leasehold improvements [Member]
Property and Equipment [Line Items]
Property and equipment	2,310	2,283
Furniture and fixtures [Member]
Property and Equipment [Line Items]
Property and equipment, estimated life	5 years
Property and equipment	793	749
Software [Member]
Property and Equipment [Line Items]
Property and equipment, estimated life	3 years
Property and equipment	305	266
Vehicles [Member]
Property and Equipment [Line Items]
Property and equipment, estimated life	5 years
Property and equipment	53	53
Office equipment [Member]
Property and Equipment [Line Items]
Property and equipment, estimated life	5 years
Property and equipment	$ 40	$ 40