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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.

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