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Corporate Restructuring Costs (Schedule Of Restructuring Costs) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]      
Total corporate restructuring costs $ 5,413 $ 6,399 $ 14,176
Employee Severance And Other Employee Transition Costs [Member]      
Restructuring Cost and Reserve [Line Items]      
Total corporate restructuring costs [1] 0 303 1,768
Recruitment And Relocation Costs [Member]      
Restructuring Cost and Reserve [Line Items]      
Total corporate restructuring costs [1] 449 874 6,231
Office Asset Impairment And Other Office Closure Costs [Member]      
Restructuring Cost and Reserve [Line Items]      
Total corporate restructuring costs [2] 0 0 1,719
Third-party And Other Costs [Member]      
Restructuring Cost and Reserve [Line Items]      
Total corporate restructuring costs [1] 4,964 5,222 4,324
Stock-based Compensation [Member]      
Restructuring Cost and Reserve [Line Items]      
Total corporate restructuring costs [1] $ 0 $ 0 $ 134
[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.