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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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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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The net result for the period of deducting operating expenses from operating revenues.

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