Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Schedule of Property and Equipment
Property and equipment, gross	$ 69,791	$ 62,519
Less accumulated depreciation and amortization	(46,634)	(43,505)
Property and equipment, net	23,157	19,014
Computers and equipment [Member]
Schedule of Property and Equipment
Property and equipment, gross	9,871	8,799
Software and development costs [Member]
Schedule of Property and Equipment
Property and equipment, gross	49,691	43,922
Furniture and fixtures [Member]
Schedule of Property and Equipment
Property and equipment, gross	3,265	3,046
Leasehold improvements [Member]
Schedule of Property and Equipment
Property and equipment, gross	$ 6,964	$ 6,752

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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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.

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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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