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Corporate Restructuring Costs (Schedule of Restructuring Costs) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]      
Total corporate restructuring costs $ 14,176 $ 42,623 $ 0
Employee Severance And Other Employee Transition Costs [Member]      
Restructuring Cost and Reserve [Line Items]      
Total corporate restructuring costs [1] 1,768 6,919 0
Recruitment And Relocation Costs [Member]      
Restructuring Cost and Reserve [Line Items]      
Total corporate restructuring costs [1] 6,231 9,952 0
Office Asset Impairment And Other Office Closure Costs [Member]      
Restructuring Cost and Reserve [Line Items]      
Total corporate restructuring costs [2] 1,719 15,571 0
Third-party And Other Costs [Member]      
Restructuring Cost and Reserve [Line Items]      
Total corporate restructuring costs [1] 4,324 8,836 0
Share-based Compensation [Member]      
Restructuring Cost and Reserve [Line Items]      
Total corporate restructuring costs [1] $ 134 $ 1,345 $ 0
[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.