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Restructuring Charges - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges (Note 5) | $ (2,615) | $ (3,214) |  | $ (10,223) | $ (16,920) |
Currency translation and other adjustments |  |  |  | (700) |  | $ (300)
Corporate |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges (Note 5) |  |  |  | (4,700) |  |
Currency translation and other adjustments |  |  |  | 0 |  | 0
Americas |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges (Note 5) |  |  |  | (2,000) | (12,500) |
Currency translation and other adjustments |  |  |  | (300) |  | (200)
International |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges (Note 5) |  |  |  | (3,500) | $ (4,400) |
Currency translation and other adjustments |  |  |  | $ (400) |  | $ (100)
Voluntary Retirement Incentive Package | Special Termination Benefits |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Severance costs |  |  | $ 11,400 |  |  |

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