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Corporate Restructuring Costs (Schedule Of Restructuring Costs) (Details) - USD ($)
$ in Thousands
 12 Months Ended
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.