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Segment Information - Schedule of Reportable Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Sales to external customers | $ 339,331 | $ 288,775 | $ 665,225 | $ 554,540
Intercompany sales | 0 | 0 | 0 | 0
Operating income | 46,797 | 13,498 | 91,232 | 32,117
Restructuring charges (Note 5) | (2,335) | (967) | (7,609) | (13,706)
Currency exchange losses, net | 815 | 2,851 | 2,823 | 3,431
Other operating expense (Note 19) | 8,018 | 29,610 | 10,842 | 29,610
Strategic Transaction Costs | 58 | 1,642 | 152 | 2,979
Adjusted operating income (loss) | 58,023 | 48,568 | 112,658 | 81,843
Americas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales to external customers | 215,339 | 174,960 | 424,468 | 341,528
Restructuring charges (Note 5) |  |  | (600) | (12,400)
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Restructuring charges (Note 5) |  |  | (3,500) |
Reportable Segments | Americas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales to external customers | 215,339 | 174,960 | 424,468 | 341,528
Intercompany sales | 36,445 | 32,264 | 70,643 | 62,453
Adjusted operating income (loss) | $ 49,838 | $ 43,573 | $ 99,924 | $ 79,724
Adjusted operating margin % | 23.10% | 24.90% | 23.50% | 23.30%
Reportable Segments | International |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales to external customers | $ 123,992 | $ 113,815 | $ 240,757 | $ 213,012
Intercompany sales | 84,514 | 75,575 | 166,893 | 145,771
Adjusted operating income (loss) | $ 15,853 | $ 12,122 | $ 28,631 | $ 19,918
Adjusted operating margin % | 12.80% | 10.70% | 11.90% | 9.40%
Reportable Segments | Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales to external customers | $ 0 | $ 0 | $ 0 | $ 0
Intercompany sales | 0 | 0 |  | 0
Adjusted operating income (loss) | (7,668) | (7,127) | (15,897) | (17,799)
Reconciling Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales to external customers | 0 | 0 | 0 | 0
Intercompany sales | (120,959) | (107,839) | (237,536) | (208,224)
Adjusted operating income (loss) | $ 0 | $ 0 | $ 0 | $ 0

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