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Segment Information (Schedule Of Revenue From Unaffiliated Customers By Geographic Area) (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Number of reportable segments | segment		1
Revenue from unaffiliated customers	$ 164,570	$ 629,094	$ 687,660	$ 646,069
United States
Revenue from unaffiliated customers		306,650	332,611	322,399
Other Americas
Revenue from unaffiliated customers		9,175	8,154	11,377
APAC
Revenue from unaffiliated customers		$ 72,866	$ 109,433	$ 91,936
Customer One | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Concentration risk (as a percentage)		11.00%	13.00%

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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, 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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