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Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 268,620	$ 314,703
Less: Accumulated depreciation	(256,888)	(288,178)
Total	11,732	26,525
Depreciation	15,600	43,500	$ 55,800
Computer hardware
Property, Plant and Equipment [Line Items]
Property and equipment, gross	184,145	214,880
Computer software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	52,135	64,509
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	8,951	9,546
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 23,389	$ 25,768

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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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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Amount before accumulated depreciation, depletion and amortization of 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, and furniture and fixtures.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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