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Corporate Restructuring Costs (Schedule Of Restructuring Costs) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total corporate restructuring costs |  | $ 6,399 | $ 14,176 | $ 42,623
Employee Severance And Other Employee Transition Costs [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total corporate restructuring costs | [1] | 303 | 1,768 | 6,919
Recruitment And Relocation Costs [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total corporate restructuring costs | [1] | 874 | 6,231 | 9,952
Office Asset Impairment And Other Office Closure Costs [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total corporate restructuring costs | [2] | 0 | 1,719 | 15,571
Third-party And Other Costs [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total corporate restructuring costs | [1] | 5,222 | 4,324 | 8,836
Stock-based Compensation [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total corporate restructuring costs | [1] | $ 0 | $ 134 | $ 1,345
[1] | Recorded in general and administrative expenses on the consolidated statements of income.
[2] | Recorded in impairment, closure costs, and asset disposals on the consolidated statements of income.

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- Definition Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan and expenses resulting from the write-down of assets. Excludes expenses related to a business combination, a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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