The number of stores associated with retail asset impairment charges.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount, before tax, of (gain) loss recognized for the (reversal of write-down) write-down to fair value, less cost to sell, of a disposal group. Excludes discontinued operations.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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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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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Operating Segments and Geographic Information (Narrative) (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) stores segments	Dec. 31, 2017 USD ($) stores	Dec. 31, 2016 USD ($) stores
Segment Reporting Information [Line Items]
Number of operating segments \| segments									3
Asset impairments									$ 2,182	$ 5,284	$ 3,144
Goodwill impairment									0	0	431
Write-off related to discontinued project									0	4,754	0
Revenues	$ 215,989	$ 261,064	$ 328,004	$ 283,148	$ 199,112	$ 243,273	$ 313,221	$ 267,907	1,088,205	1,023,513	1,036,273
Americas
Segment Reporting Information [Line Items]
Revenues									520,192
Asia Pacific
Segment Reporting Information [Line Items]
Revenues									344,598
EMEA
Segment Reporting Information [Line Items]
Revenues									220,270
Operating Segments
Segment Reporting Information [Line Items]
Revenues									1,085,060	1,022,643	1,035,528
Operating Segments \| Americas
Segment Reporting Information [Line Items]
Asset impairments									$ 100	$ 500	$ 1,700
Number of retail stores with impairment charges \| stores									1	3	12
Revenues									$ 520,192	$ 480,146	$ 467,006
Operating Segments \| Asia Pacific
Segment Reporting Information [Line Items]
Asset impairments									$ 800		$ 600
Number of retail stores with impairment charges \| stores									12		19
Revenues									$ 344,598	336,073	$ 355,284
Operating Segments \| EMEA
Segment Reporting Information [Line Items]
Asset impairments										$ 100	$ 400
Number of retail stores with impairment charges \| stores										1	11
Goodwill impairment											$ 400
Revenues									220,270	$ 206,424	213,238
Non-US
Segment Reporting Information [Line Items]
Revenues									$ 645,661	$ 634,666	$ 651,334
Geographic Concentration Risk \| Sales Revenue, Net \| Japan
Segment Reporting Information [Line Items]
Percentage of consolidated revenues (percent)											10.60%