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Organization and Summary of Significant Accounting Policies - Other Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Other Assets |  |
Deferred compensation plan assets | $ 17,074 | $ 15,053
Investments in privately held companies | 12,043 | 17,129
Long-term notes receivable | 2,196 | 2,722
Other | 6,363 | 6,557
Total Other Assets | $ 37,676 | $ 41,461

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