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Corporate Restructuring Costs (Schedule of Restructuring Costs) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Restructuring Cost and Reserve [Line Items]    
Total restructuring costs $ 5,675 $ 0
Employee Severance and Other Employee Transition Costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges [1] 1,046 0
Recruitment and Relocation Costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges [1] 2,093 0
Operating Lease Impairment And Other Office Closure Costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges [2] 1,395 0
Third-party and Other Costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges [1] 1,007 0
Share-based Compensation [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges [1] $ 134 $ 0
[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.