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Corporate Restructuring Costs (Schedule of Restructuring Costs) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Restructuring Cost and Reserve [Line Items]        
Total restructuring costs $ 3,922 $ 13,773 $ 9,597 $ 13,773
Employee Severance and Other Employee Transition Costs [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges [1] 460 493 1,506 493
Recruitment and Relocation Costs [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges [1] 2,107 207 4,200 207
Operating Lease Impairment And Other Office Closure Costs [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges [2] 324 16,299 1,719 16,299
Third-party and Other Costs [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges [1] 1,031 3,200 2,038 3,200
Share-based Compensation [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges [1] $ 0 $ (6,426) $ 134 $ (6,426)
[1] Recorded in general and administrative expenses on the condensed consolidated statement of income.
[2] Recorded in impairment, closure costs, and asset disposals on the condensed consolidated statement of income.