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Revenue (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 299,288,000	$ 288,614,000
US [Member]
Disaggregation of Revenue [Line Items]
Revenues	177,542,000	173,082,000
EMEA [Member]
Disaggregation of Revenue [Line Items]
Revenues	53,417,000	52,727,000
China [Member]
Disaggregation of Revenue [Line Items]
Revenues	25,858,000	27,453,000
Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 42,471,000	$ 35,352,000

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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.

+ References

No definition available.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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