Acquisition and Transition Costs and Special Charges, Including Business Realignment Costs (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Acquisition and Transition Costs	$ 562	$ 1,013	$ 21
Special Charges, Including Business Realignment Costs	$ 46,645	10,141	5,012
Headcount Reductions (as a percent)	8.00%
Impairment of Goodwill	$ 0	2,921	$ 0
Special Charges [Member]
Business Acquisition [Line Items]
Restructuring Charges	41,669	2,850
Accelerated Depreciation For Leasehold Improvements	3,320	4,370
Asset Impairment Charges	$ 1,656
Impairment of Goodwill		$ 2,921

Accelerated Depreciation For Leasehold Improvements

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- Definition

Special Charges incurred related to the impairment of intangible assets, Special Charges incurred in connection with exiting facilities and Special Charges related to acquisitions, including the exiting of facilities for office space, introducing fees as well as other professional fees

+ References

No definition available.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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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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No definition available.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Percentage of the total number of positions eliminated as of the balance sheet date since inception of the restructuring plan(s).

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No definition available.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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