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Details of Selected Balance Sheet Accounts - Other Noncurrent Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Details of Selected Balance Sheet Accounts [Abstract] |  |
Deferred compensation plan | $ 24,609 | $ 22,801
Deferred financing costs | 2,886 | 0
Deferred income taxes | 1,281 | 1,280
Other | 5,089 | 5,646
Other noncurrent assets | $ 33,865 | $ 29,727

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