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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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