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Employee Benefit Plans (Incurred Expenses Related To Defined Contribution Plans For U.S. Employees) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Employee Benefit Plans [Abstract] |  |  |
Incurred expenses | $ 14,386 | $ 10,794 | $ 9,301

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