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Property and Equipment - Summary of Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,889,896	$ 1,907,104
Less: Accumulated depreciation and amortization	1,074,887	1,070,898
Property and equipment, net	815,009	836,206
Computer hardware and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 974,490	931,891
Computer hardware and software | Minimum
Property, Plant and Equipment [Line Items]
Useful Lives	2 years
Computer hardware and software | Maximum
Property, Plant and Equipment [Line Items]
Useful Lives	10 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 554,252	510,917
Leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Useful Lives	1 year
Leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Useful Lives	15 years
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 243,880	334,625
Furniture and equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful Lives	1 year
Furniture and equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful Lives	10 years
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 117,274	$ 129,671

X

- Definition

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

+ References

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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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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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