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Operating Segments and Geographic Information (Narrative) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) segments | Jun. 30, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of operating segments | segments |  |  | 3 |
Increase in income from operations | $ 37,064 | $ 29,446 | $ 62,986 | $ 45,028
Unallocated corporate and other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Increase in income from operations | $ (41,182) | (47,984) | $ (77,312) | (88,133)
Adjustments for revised presentation [Member] | Americas [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Increase in income from operations |  | 9,221 |  | 9,526
Adjustments for revised presentation [Member] | Asia Pacific [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Increase in income from operations |  | 3,438 |  | 3,466
Adjustments for revised presentation [Member] | Europe [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Increase in income from operations |  | 1,265 |  | 1,277
Adjustments for revised presentation [Member] | Unallocated corporate and other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Increase in income from operations |  | $ 13,924 |  | $ 14,269

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